Unconventional lad, tho’ far from fashionable (3,3)
I believe the answer is:
old hat
'far from fashionable' is the definition.
'unconventional lad tho'' is the wordplay.
'unconventional' is an anagram indicator.
'lad'+'tho'='ladtho'
'ladtho' is an anagram of 'OLD-HAT'.
(Other definitions for old hat that I've seen before include "Passe" , "Something tediously familiar" , "Tediously familiar or outdated, like obsolete headgear" , "Out of fashion, headgear perhaps" , "Dolly Varden perhaps?" .)