Lighter and warmer finally, after a fire is lit (6)
I believe the answer is:
fairer
'lighter' is the definition.
(I've seen this before)
'warmer finally after a fire is lit' is the wordplay.
'finally' says to take the final letters.
'after' is a charade indicator (letters next to each other).
'is lit' is an anagram indicator (lit can mean drunk).
The last letter of 'warmer' is 'r'.
'a'+'fire'='afire'
'afire' is an anagram of 'faire'.
'r' after 'faire' is 'FAIRER'.
'and' is the link.
(Other definitions for fairer that I've seen before include "Cleaner" , "More equitable or blonde" , "more sunny" , "Blonder" , "More blond or equitable" .)