Useless clothes? (4)
I believe the answer is:
duds
'useless clothes?' is the definition.
'duds' can be an answer for 'clothes?' (duds is a kind of clothes). I am unsure of the 'useless' bit.
'useless clothes?' is the wordplay.
'useless' becomes 'dud' (I've seen this before).
'clothes?' becomes 's' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'dud'+'s'='DUDS'
Can you help me to learn more?
(Other definitions for duds that I've seen before include "Failures; clothes" , "Bombs that fail to explode" , "One assumes them" .)