Crossword Genius

Agreement with one playing instrument (9)

Ross

I believe the answer is:

accordion

'instrument' is the definition.
(accordion is a kind of instrument)

'agreement with one playing' is the wordplay.
'agreement' becomes 'accord' ('accord' can be a synonym of 'agreement'**).
'with' is a charade indicator (letters next to each other).
'one' becomes 'i' (Roman numeral).
'playing' becomes 'on'.
'accord'+'i'+'on'='ACCORDION'

(Other definitions for accordion that I've seen before include "Free-reed aerophone" , "It's played" , "Cad I croon about a musical instrument" , "Squeeze-box" , "Squeeze box" .)

I've seen this clue in The Sun.
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