Debt collector back in action exposed (7)
I believe the answer is:
denuded
'exposed' is the definition.
(thesaurus)
'debt collector back in action' is the wordplay.
'debt collector' becomes 'dun' (I've seen this in other clues).
'back' is a reversal indicator.
'in' indicates putting letters inside.
'action' becomes 'deed' (deed is a kind of action).
'dun' reversed gives 'nud'.
'nud' inserted inside 'deed' is 'DENUDED'.
(Other definitions for denuded that I've seen before include "Laid bare" , "Stripped" .)