The most common and most likely answer to this crossword clue is the 7 letter word SECONDS
I've seen this crossword clue in The Daily Telegraph
S
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More clues leading to the result SECONDS
- Endorses inferior goods for sale
- Supporters helping
- Supporters that Oliver requested?
- Supports another helping for a short period
- One hand indicates this, another helping
- Time for some more food
- Inferior articles that don’t last long
- Ring assistants for more food
- Supports units for brief periods
- Endorses merchandise that’s less than perfect
Buddy explains!

The straight part
We know that "Extra helpings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extra helpings = seconds.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does SECONDS mean?
SECONDS noun- Something that is number two in a series.
- Something that is next in rank, quality, precedence, position, status, or authority.
- The place that is next below or after first in a race or contest.
- (usually in the plural) A manufactured item that, though still usable, fails to meet quality control standards.
- (usually in the plural) An additional helping of food.
- A chance or attempt to achieve what should have been done the first time, usually indicating success this time around. (See second-guess.)
- The interval between two adjacent notes in a diatonic scale (either or both of them may be raised or lowered from the basic scale via any type of accidental).
- The second gear of an engine.
- Second base.
- The agent of a party to an honour dispute whose role was to try to resolve the dispute or to make the necessary arrangements for a duel.
- A Cub Scout appointed to assist the sixer.
- To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (See under #Etymology 3 for translations.)
- To follow in the next place; to succeed.
- To climb after a lead climber.
- One-sixtieth of a minute; the SI unit of time, defined as the duration of 9,192,631,770 periods of radiation corresponding to the transition between two hyperfine levels of caesium-133 in a ground state at a temperature of absolute zero and at rest.
- A unit of angle equal to one-sixtieth of a minute of arc or one part in 3600 of a degree.
- A short, indeterminate amount of time.
- One who supports another in a contest or combat, such as a dueller's assistant.
- One who supports or seconds a motion, or the act itself, as required in certain meetings to pass judgement etc.
- Aid; assistance; help.
- To transfer temporarily to alternative employment.
- To assist or support; to back.
- To agree as a second person to (a proposal), usually to reach a necessary quorum of two. (This may come from the English adjective above.)
- To accompany by singing as the second performer.