The most common and most likely answer to this crossword clue is the 3 letter word BYE
I've seen this crossword clue in Financial Times
B
Y
E
More clues leading to the result BYE
Buddy explains!
The straight part
We know that "Extra" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case extra = bye.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 BYE mean?
BYE noun- The position of a person or team in a tournament or competition who draws no opponent in a particular round so advances to the next round unopposed, or is awarded points for a win in a league table; also the phantom opponent of such a person or team.
- An extra scored when the batsmen take runs after the ball has passed the striker without hitting either the bat or the batsman.
- A dwelling.
- A thing not directly aimed at; something which is a secondary object of regard; an object by the way, etc.
- A pass.
- Goodbye.
- A flying insect, of the clade Anthophila within the hymenopteran superfamily Apoidea, known for its organised societies (though only a minority have them), for collecting pollen and (in some species) producing wax and honey.
- A contest, especially for spelling; see spelling bee.
- A community gathering to share labour, e.g. a sewing bee or a quilting bee.
- A ring or torque; a bracelet.
- The name of the Latin-script letter B.
- (usually in the plural) Any of the pieces of hard wood bolted to the sides of the bowsprit, to reeve the fore-topmast stays through.
- Near or next to.
- From one side of something to the other, passing close by; past.
- Not later than (the given time); not later than the end of (the given time interval).
- Indicates the person or thing that does or causes something: Through the action or presence of.
- Indicates the creator of a work: Existing through the authorship etc. of.
- Indicates a means of achieving something: Involving/using the means of.
- Indicates an authority according to which something is done.
- Indicates a means of classification or organisation.
- Indicates the amount of change, difference or discrepancy
- In the formulae X by X and by Xs, indicates a steady progression, one X after another.
- Indicates a referenced source: According to.
- Used to separate dimensions when describing the size of something.
- (horse breeding) Designates a horse's male parent (sire); cf. out of.