It's chewed ruminatively (3)

I believe the answer is:

cud

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'it's chewed' is the definition.
(cud is regurgitated food chewed by animals)

I cannot understand how the rest of the clue works.

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(Other definitions for cud that I've seen before include "It's partly digested and chewed again" , "Ruminant animals chew it" , "Something to be chewed" , "THIRD PART OF 23" , "Re-chewed food of a ruminant" .)

I've seen this clue in the Evening Standard.

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