Crossword Genius

Where butter may be found in the groove (2,1,4)

Ross

I believe the answer is:

on a roll

'in the groove' is the definition.

I cannot understand how the remainder of the clue works.

(Other definitions for on a roll that I've seen before include "How butter may be spread" , "Where one may find sesame seeds" , "continually successful" , "Being extremely jammy, maybe" , "Going through a good patch" .)

I've seen this clue in The Times.
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