The most common and most likely answer to this crossword clue is the 5 letter word MASTS
I've seen this crossword clue in Independent
M
A
S
T
S
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The straight part
We know that "Supports" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case supports = masts.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 MASTS mean?
MASTS noun- A tall, slim post or tower, usually tapering upward, used to support, for example, the sails on a ship, flags, floodlights, meteorological instruments ,or communications equipment such as an aerial, usually supported by guy-wires.
- A non-judicial punishment ("NJP") disciplinary hearing under which a commanding officer studies and disposes of cases involving those under his command.
- To supply and fit a mast to (a ship).
- The fruit of forest-trees (beech, oak, chestnut, pecan, etc.), especially if having fallen from the tree, used as fodder for pigs and other animals.
- (of swine and other animals) To feed on forest seed or fruit.
- (of a population of plants) To vary fruit and seed production in multi-year cycles.
- A type of heavy cue, with the broad end of which one strikes the ball.