A French young man going around about naked (6)
I believe the answer is:
unclad
'naked' is the definition.
(I've seen this before)
'a french young man going around about' is the wordplay.
'a french' becomes 'un' ('a' in French).
'young man' becomes 'lad' (I've seen this before).
'going around' is an insertion indicator.
'about' becomes 'c' (abbreviation for 'circa').
'un'+'lad'='unlad'
'unlad' placed around 'c' is 'UNCLAD'.
(Other definitions for unclad that I've seen before include "Not dressed" , "In one's birthday suit" , "Uncovered" , "Undressed" , "with nothing on" .)