PC, not entirely bright one (5-2)
I believe the answer is:
right-on
'pc' is the definition.
(PC can stand for politically correct)
'not entirely bright one' is the wordplay.
'not entirely' indicates a hidden word.
'RIGHT-ON' is hidden within 'bright one'.
(Other definitions for right-on that I've seen before include "Trendy" , "Absolutely correct" .)
I've seen this clue in The Guardian.
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