Performer, in revolt, quits unexpectedly (13)

I believe the answer is:

ventriloquist

'performer' is the definition.
(I know that ventriloquist is a type of performer)

'in revolt quits unexpectedly' is the wordplay.
'unexpectedly' indicates an anagram.
'in'+'revolt'+'quits'='inrevoltquits'
'inrevoltquits' anagrammed gives 'VENTRILOQUIST'.

(Other definitions for ventriloquist that I've seen before include "Dummy operator" , "Performer with dummy" , "Voice-thrower" .)

I've seen this clue in The Telegraph.

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