Clothes on fire? (7)
I believe the answer is:
blazers
'clothes on fire?' is the definition.
Although both the answer and 'fire?' are nouns, they are not in the same form of the noun.
'clothes on fire?' is the wordplay.
'clothes' becomes 'blazer' (blazer is a kind of clothes).
'on fire?' becomes 's' (I can't justify this - if you can you should believe this answer much more).
'blazer'+'s'='BLAZERS'
Can you help me to learn more?
(Other definitions for blazers that I've seen before include "garments" , "Fire risks" , "Sporting jackets" , "in evidence at Henley regatta?" , "Jackets (often worn with a 1 across)" .)