Pay lone pair to rehash instrument from the 1920s? (6-5)

I believe the answer is:

player-piano

'instrument from the 1920s?' is the definition.
(instrument popular in the 1920s)

'pay lone pair to rehash' is the wordplay.
'to rehash' indicates an anagram.
'pay'+'lone'+'pair'='paylonepair'
'paylonepair' with letters rearranged gives 'PLAYER-PIANO'.

I've seen this clue in The Times.

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