It's a very old fiddle! (4)

I believe the answer is:

viol

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'old fiddle' is the definition.
(I've seen this in another clue)

I can't explain the rest of the clue.

(Other definitions for viol that I've seen before include "Old stringed instrument" , "Old consort instrument" , "something from the past to play" , "Precursor of the violin" , "Early string instrument" .)

I've seen this clue in the Evening Standard.

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