Crossword Genius

Some hours which minutes on piano might stretch into? (9)

Ross

I believe the answer is:

afternoon

'some hours' is the definition.
(hours of the day)

I don't understand the remainder of the clue.

(Other definitions for afternoon that I've seen before include "No ante for this part of the day" , "Latter part of daylight hours" , "Post-midday" , "Midday to evening" , "Post midday" .)

I've seen this clue in The Times.
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