22 down
Uncompromising
boss
ultimately
deceived
on
Radio
4
(6)
Uncompromising boss ultimately deceived on Radio 4 (6)
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hints
The definition is at the beginning of the clue.
How the clue works
The definition is Uncompromising. You take S — the last letter, 'ultimately', of 'boss' — then add TRICT, which sounds like 'tricked' (meaning deceived), with 'Radio' doing duty as the homophone indicator. As for 'Radio 4', that's just dressing on the surface — the '4' here refers to the answer to 4 down rather than being part of the wordplay itself.