Puncture wound rabbit eventually conceals (4)
I believe the answer is:
bite
'puncture' is the definition.
(thesaurus)
'wound rabbit eventually conceals' is the wordplay.
'conceals' indicates a hidden word.
'BITE' is hidden in the letters of 'wound rabbit eventually'.
(Other definitions for bite that I've seen before include "Injury from teeth" , "Nip; nibble" , "Take effect; snack" , "Grip; take effect" , "Clamp down teeth" .)