Rubbish unacceptable to vegetarians (5)

I believe the answer is:

tripe

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'rubbish' is the definition.
('tripe' can be a synonym of 'rubbish')

I can't explain the remainder of the clue.

(Other definitions for tripe that I've seen before include "Rot" , "Ruminant's stomach lining" , "Junk; food" , "Rubbish; offal" , "Rubbish, nonsense" .)

I've seen this clue in the Evening Standard.

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