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Ignored at intervals, Doug's really revolutionary musical piece (5)

Ross

I believe the answer is:

largo

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'musical piece' is the definition.
(I've seen this before)

I can't explain the remainder of the clue.

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(Other definitions for largo that I've seen before include "Slow passage" , "Slow and dignified tempo in music" , "Handel's piece?" , "major key" , "Deliberately" .)

I've seen this clue in The Telegraph.
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