Cake to have covered in cheese (7)
I believe the answer is:
brownie
'cake' is the definition.
(I've seen this before)
'have covered in cheese' is the wordplay.
'have' becomes 'own' ('own' can be a synonym of 'have').
'covered in' indicates putting letters inside.
'cheese' becomes 'brie' (Brie is an example).
'own' put into 'brie' is 'BROWNIE'.
'to' acts as a link.
(Other definitions for brownie that I've seen before include "Benevolent helper" , "nutty cake" , "Junior Girl Scout" , "Chocolate cake; elf" , "Girl cub - chocolate cake" .)