Food -- I love toast (7)
I believe the answer is:
cheerio
'toast' is the definition.
(I've seen this before)
'food i love' is the wordplay.
'food' becomes 'cheer' (I've seen this before).
'love' becomes 'o' (love means zero in tennis).
'cheer'+'i'+'o'='CHEERIO'
(Other definitions for cheerio that I've seen before include "Final message" , "Expression used when leaving" , "British romance imprint" , "for so long!" , "A final word" .)