Crossword Genius

Tune on piano for twosome (4)

Ross

I believe the answer is:

pair

'twosome' is the definition.
('pair' can be a synonym of 'twosome')

'tune on piano' is the wordplay.
'tune' becomes 'air' (I've seen this before).
'on' is a charade indicator (letters next to each other).
'piano' becomes 'p'.
'air' put after 'p' is 'PAIR'.

'for' acts as a link.

(Other definitions for pair that I've seen before include "Cereal used as food" , "Twins" , "Agreement to avoid division" , "how braces come" , "Couple - wed" .)

I've seen this clue in The Independent.
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