Those with a boring interest in clothing? (7)
I believe the answer is:
anoraks
'those with a boring interest in clothing?' is the definition.
I can't judge whether this defines the answer.
'those with a' is the wordplay.
I cannot really see how this works, but
'a' could be 'an' and 'an' is found within the answer.
This explanation may well be incorrect...
(Other definitions for anoraks that I've seen before include "protection" , "Hooded waterproof jackets" .)