Crossword Genius

Old music maker is only after old wine (7)

Ross

I believe the answer is:

sackbut

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'old music maker' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

'only after old wine' is the wordplay.
'only' becomes 'but' (but can mean only - eg 'life is but a dream').
'after' says to put letters next to each other.
'old wine' becomes 'sack' (I've seen this before).
'but' after 'sack' is 'SACKBUT'.

'is' acts as a link.

Can you help me to learn more?

(Other definitions for sackbut that I've seen before include "Early form of trombone" , "music maker" , "one blows into it" , "Musical instrument of the Renaissance" , "one on the slide" .)

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