This will cool down the food with a flourish! (7)
I believe the answer is:
fanfare
'flourish' is the definition.
(I know that flourish can be written as fanfare)
'this will cool down the food with a' is the wordplay.
'this will cool down' becomes 'f' (I am not sure about this - if you are sure you should believe this answer much more).
'the food' becomes 'fare' (fare is a kind of food).
'with' means one lot of letters go next to another.
'a' becomes 'an'.
'fare' after 'an' is 'anfare'.
'f'+'anfare'='FANFARE'
Can you help me to learn more?
(Other definitions for fanfare that I've seen before include "elaborate ceremony" , "Naff era (anag)" , "Flourish played at military Ceremonial" , "Trumpet call" , "Brass flourish" .)