Strange nude wandering about town freely (8)
I believe the answer is:
unwonted
'strange' is the definition.
(thesaurus)
'nude wandering about town freely' is the wordplay.
'wandering' indicates anagramming the letters.
'about' is an insertion indicator.
'freely' indicates anagramming the letters.
'nude' with letters rearranged gives 'uned'.
'town' anagrammed gives 'wont'.
'uned' placed around 'wont' is 'UNWONTED'.
(Other definitions for unwonted that I've seen before include "Unaccustomed" , "Atypical, not usual" , "not typical" , "Out of the ordinary, uncommon" , "Not characteristic" .)