Prowler in deli, one's shoplifting (7)
I believe the answer is:
lioness
'prowler' is the definition.
'in deli one's shoplifting' is the wordplay.
'in' indicates the answer is hidden within the clue.
'LIONESS' can be found hidden inside 'deli ones shoplifting'.
(Other definitions for lioness that I've seen before include "It's beastly" , "Wild animal" , "Large cat" , "Predator" , "Female pride member" .)