The language of love? (7)
I believe the answer is:
romance
I believe this is a double definition.
'the language' is the first definition.
(Romance is an example)
'love?' is the second definition.
(romancing is a kind of loving)
'of' acts as a link.
(Other definitions for romance that I've seen before include "Lie" , "Cameron (anag) - love story" , "Affair of the heart" , "Various languages such as French" , "Group of languages" .)