Toast his work and brighten his image (7)
I believe the answer is:
burnish
'brighten his image' is the definition.
'burnish' can be an answer for 'brighten' (thesaurus). I'm unsure of the 'his image' bit.
'toast his work' is the wordplay.
'toast' becomes 'burn' (I am not sure about this - if you are sure you should believe this answer much more).
'work' indicates anagramming the letters.
'his' anagrammed gives 'ish'.
'burn'+'ish'='BURNISH'
'and' acts as a link.
Can you help me to learn more?
(Other definitions for burnish that I've seen before include "Make shiny by friction" , "Shine by rubbing" , "Make bright by rubbing" , "Polish to a high shine" , "Polish by rubbing" .)