In some versions of draughts, to remove an opponent's piece as a penalty for failing to capture with it (4)
I believe the answer is:
huff
'in' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for huff that I've seen before include "A state of annoyance" , "Sulk" , "fit of anger" , "Passing mood of anger" , "Mood of umbrage" .)