Nanny makes a teatime spread (6)

I believe the answer is:

butter

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'spread' is the definition.
(butter is a spread)

I don't understand the rest of the clue.

(Other definitions for butter that I've seen before include "Fat - type of fly" , "goat?" , "Bread-spread made from milk" , "Edible fat" , "Dairy spread" .)

I've seen this clue in The Globe and Mail.

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