Crossword Genius

Sonatina played endlessly in many a country (7)

Ross

I believe the answer is:

nations

'many a country' is the definition.
(more than one nation)

I can't explain the rest of the clue.

(Other definitions for nations that I've seen before include "Countries" , "No stain (anag.)" .)

I've seen this clue in The Guardian.
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