Naked poke, no good (4)
I believe the answer is:
nude
'naked' is the definition.
(I know that naked can be written as nude)
'poke no good' is the wordplay.
'poke' becomes 'nudge' (I've seen this before).
'no' suggests deleting specific letters.
'good' becomes 'g' (abbreviation).
'nudge' with 'g' taken out is 'NUDE'.
(Other definitions for nude that I've seen before include "Wearing no clothes" , "rejecting coverage?" , "Naked art subject" , "Not dressed" , "In the altogether" .)