Announcer on the radio for match (7)
I believe the answer is:
Here is my best explanation:
'match' is the definition.
'announcer on the radio' is the wordplay.
'announcer' becomes 'compere'.
'on the radio' shows a homophone (sound like).
'compere' sounds like 'COMPARE'.
'for' is the link.
(Other definitions for compare that I've seen before include "Liken", "Represent as similar; sounds like emcee", "Contrast - liken", "Look at differences and similarities between (things)" and "what discriminators do".)