The food of love? (5)
This clue is a double definition.
'the food' is the first definition.
(duck is a kind of food)
'love' is the second definition.
(love and duck mean zero in tennis and cricket)
'of' acts as a link.
(Other definitions for duck that I've seen before include "sporting failure" , "Mallard, say, or eider" , "Dip" , "Water bird; zero score" , "Shoveler, for example" .)
'the food of love?' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for music that I've seen before include "A score represents it" , "Country, say" , "Composed sounds" , "Organised notes (that must sometimes be faced)" , "Strains" .)