A girlfriend is blazing (6)
I believe the answer is:
aflame
'blazing' is the definition.
(synonyms)
'a girlfriend' is the wordplay.
I cannot really see how this works, but
'a' is present in the answer.
The remaining letters 'flame' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for aflame that I've seen before include "fired up?" , "Deeply aroused" , "Ablaze" , "Indicating excitement" , "Ardent" .)