Wear thin, possibly becoming bare (2,3,3)
I believe the answer is:
in the raw
'bare' is the definition.
(thesaurus)
'wear thin possibly' is the wordplay.
'possibly' indicates anagramming the letters.
'wear'+'thin'='wearthin'
'wearthin' with letters rearranged gives 'IN THE RAW'.
'becoming' acts as a link.
(Other definitions for in the raw that I've seen before include "plain" , "Nude - or served uncooked" , "without clothing at last?" , "Naked, or without refining influence" , "21 26 [IN THE ALTOGETHER]" .)