Crossword Genius

Bill might be ready for a singalong (7)

Ross

I believe the answer is:

invoice

'bill might be' is the definition.
(invoice is a type of bill)

I can't explain the rest of the clue.

(Other definitions for invoice that I've seen before include "Document detailing costs - ready to sing (7;2,5)" , "Statement of money owed" , "List of goods sold" , "Statement for goods" , "Send bill for payment" .)

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