25 down
Group
not
allowed
on
the
radio
(4)
Group not allowed on the radio (4)
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The definition is at the beginning of the clue.
How the clue works
The definition is Group — straightforward enough. not allowed on the radio is the sneaky bit, where "on the radio" signals a homophone, so you're hearing BANNED (not allowed) spoken aloud, which sounds just like your answer.