The most common and most likely answer to this crossword clue is the 9 letter word FLINCHING
I've seen this crossword clue in The Times
F
L
I
N
C
H
I
N
G
Buddy explains!
The straight part
We know that "Wincing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wincing = flinching.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 FLINCHING mean?
FLINCHING verb- To strip the blubber or skin from, as from a whale, seal, etc.
- To make a sudden, involuntary movement in response to a (usually negative) stimulus; to cringe.
- To dodge (a question), to avoid an unpleasant task or duty
- To let the foot slip from a ball, when attempting to give a tight croquet.
- A flinching motion; a flinch.