Crossword Genius

Threesome left out rubbish (5)

Ross

I believe the answer is:

tripe

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'rubbish' is the definition.
(both can mean nonsense)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for tripe that I've seen before include "Rubbish (edible, maybe)" , "Junk; food" , "Garbage" , "Something to eat" , "Edible entrails" .)

I've seen this clue in The Sun.
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