Pavarotti had mashed tuber with this! (6)

I believe the answer is:

butter

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'pavarotti had mashed tuber with this' is the definition.
The definition suggests a singular noun which matches the answer.

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(Other definitions for butter that I've seen before include "Bread-spread made from milk" , "Milk product" , "Edible fat" , "Spread derived from cream" , "goat?" .)

I've seen this clue in The Irish Times.

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