Roll and cheese sandwiches essentially for champion (7)
I believe the answer is:
brioche
'roll' is the definition.
(brioche is a kind of roll)
'cheese sandwiches essentially for champion' is the wordplay.
'cheese' becomes 'brie' (Brie is an example).
'sandwiches' means one lot of letters goes inside another (to sandwich is to block something in).
'essentially' means to look at the middle letters.
'champion' becomes 'ch' (I've seen this in other clues).
The middle letter of 'for' is 'o'.
'o'+'ch'='och'
'brie' going around 'och' is 'BRIOCHE'.
'and' is the link.
(Other definitions for brioche that I've seen before include "Light sweetish roll" , "French bread roll" , "Hire cob (anag) - bread" , "Type of light soft roll" , "Idol" .)