The campanologist’s double? (6)

I believe the answer is:

ringer

This clue is a double definition.

'the campanologist's' is the first definition.
(I've seen this before)

'double?' is the second definition.
(thesaurus)

(Other definitions for ringer that I've seen before include "Doppelganger" , "See 22" , "American impostor" , "Lookalike" , "pulling Tom?" .)

I've seen this clue in the Evening Standard.

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