Garment on fire? (6)
I believe the answer is:
blazer
I believe this clue is a double definition.
'garment' is the first definition.
(blazer is a kind of garment)
'fire?' is the second definition.
(I've seen this before)
'on' acts as a link.
(Other definitions for blazer that I've seen before include "Uniform jacket" , "Summer sporting jacket" , "Man's garment" , "First to trail" , "Light single-breasted (school or club) jacket" .)