Ours meld, melt and burn (8)
I believe the answer is:
smoulder
'burn' is the definition.
(smouldering is a kind of burning)
'ours meld melt' is the wordplay.
'melt' is an anagram indicator.
'ours'+'meld'='oursmeld'
'oursmeld' anagrammed gives 'SMOULDER'.
'and' is the link.
(Other definitions for smoulder that I've seen before include "Burn slowly without flame" , "Burn without flames" , "Burn slowly with smoke but no flame" , "Burn and smoke without flame" , "Fume" .)