More becoming, holding old instrument (5)

I believe the answer is:

rebec

'old instrument' is the definition.
(I've seen this before)

'more becoming holding' is the wordplay.
'holding' indicates the answer is hidden within the clue.
'REBEC' is hidden within 'more becoming'.

(Other definitions for rebec that I've seen before include "Mediaeval stringed instrument" , "Old stringed instrument" , "Medieval bowed instrument" .)

I've seen this clue in The Daily Express.

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