Naked person going around in “invisible dungarees” (4)
I believe the answer is:
nude
'naked person' is the definition.
(I've seen this before)
'going around in invisible dungarees' is the wordplay.
'going around' shows that the letters should be reversed in order.
'in' indicates a hidden word.
'edun' is hidden in the letters of 'invisible dungarees'.
'edun' back-to-front is 'NUDE'.
(Other definitions for nude that I've seen before include "Undraped figure" , "Wearing no clothes" , "Without cover" , "In the altogether" , "Unclad" .)