Crossword Genius

Line, one nailed by a fool one's played (9)

Ross

I believe the answer is:

accordion

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Here is my best explanation:

'one's played' is the definition.

'line one nailed by a fool' is the wordplay.
'line' becomes 'cord' (cord is a kind of line).
'one' becomes 'i' (Roman numeral).
'nailed by' indicates putting letters inside.
'fool' becomes 'con'.
'cord'+'i'='cordi'
'a'+'con'='acon'
'cordi' inserted within 'acon' is 'ACCORDION'.

Ross

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This clue was last seen in The Guardian

(Other definitions for accordion that I've seen before include "Box-shaped musical instrument", "Cad I croon about a musical instrument", "Bellows-operated instrument", "Agreement starts the musical instrument", "Squeeze-box", "Free-reed aerophone", "Musical instrument", "box-shaped musical instrument like melodeon", "squeeze it while operating keys" and "It's played".)

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