Studs in tatty clothing not for them (7)
I believe the answer is:
nudists
'clothing not for them' is the definition.
(people who prefer nudity to clothing)
'studs in tatty' is the wordplay.
'tatty' is an anagram indicator.
'studs'+'in'='studsin'
'studsin' with letters rearranged gives 'NUDISTS'.
(Other definitions for nudists that I've seen before include "they reveal all" , "Things abandoned by those" , "Strippers?" , "they're not in gear" , "They're exposed" .)