Turn over in the mind (4)

I believe the answer is:

mull

(Other definitions for mull that I've seen before include "Point for Scots" , "how to make a warming drink" , "Inner Hebridean island" , "Island of the Inner Hebrides -- think long and deeply" , "Warm (wine) with spices; Scottish island" .)

I've seen this clue in The Telegraph.

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