Glowing report dispatched after I left hot sweets (12)
I believe the answer is:
incandescent
'glowing' is the definition.
(I've seen this before)
'report dispatched after i left hot sweets' is the wordplay.
I cannot quite understand how this works, but
'i' could be 'a' and 'a' is found within the answer.
'hot' could be 'in' (both can mean fashionable) and 'in' is located in the answer.
This may be the basis of clue (or it may be nonsense).
(Other definitions for incandescent that I've seen before include "livid" , "Dazzling" , "Glowing brightly" , "White-hot" , "Glowing with heat" .)