Wanting to give opponent a hiding (4)
I believe the answer is:
anti
'opponent a hiding' is the definition.
I can't tell whether this defines the answer.
'wanting to give' is the wordplay.
'to give' says the answer is hidden in the clue (I've seen 'gives' mean this).
'ANTI' is hidden in the letters of 'wanting'.
(Other definitions for anti that I've seen before include "'No' voter" , "one opposing?" , "Not favouring" , "Not in favor of" , "Definitely not pro" .)