Crossword Genius

Persist in performing vile rap (7)

Ross

I believe the answer is:

prevail

'persist in' is the definition.
(prevailing is a kind of persisting in)

'performing vile rap' is the wordplay.
'performing' indicates an anagram.
'vile'+'rap'='vilerap'
'vilerap' is an anagram of 'PREVAIL'.

(Other definitions for prevail that I've seen before include "Successfully persuade" , "Carry the day" , "Exist generally" , "Win through" , "Get one's way" .)

I've seen this clue in The Irish Times.
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