Jack's in the right area (3)
I believe the answer is:
tar
'jack's' is the definition.
(thesaurus)
'in the right area' is the wordplay.
'in' indicates a hidden word.
'TAR' is hidden in the letters of 'right area'.
(Other definitions for tar that I've seen before include "Sailor; road surface" , "Thick, black and sticky liquid" , "prepare for feathers?" , "Sailor - laid on road" , "Jack < to blacken" .)