Wound concealed by constable (4)
I believe the answer is:
stab
'wound' is the definition.
(thesaurus)
'concealed by constable' is the wordplay.
'concealed' says the answer is hidden in the clue.
'STAB' is hidden within 'by constable'.
(Other definitions for stab that I've seen before include "Impale; attempt" , "Pierce with something pointed" , "It could be the death of you" , "Pierce with a knife" , "Strike with knife" .)