Fire or non-fire, possibly (7)
I believe the answer is:
inferno
'fire' is the definition.
(I've seen this before)
'non-fire possibly' is the wordplay.
'possibly' is an anagram indicator.
'non'+'fire'='nonfire'
'nonfire' anagrammed gives 'INFERNO'.
'or' is the link.
(Other definitions for inferno that I've seen before include "Large dangerous fire" , "hot spot" , "Huge fire" , "Fierce fire" , "Hellish poem" .)