Crossword Genius

Disturbed diggers and I must vomit (8)

Ross

I believe the answer is:

disgorge

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'vomit' is the definition.
(synonyms)

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for disgorge that I've seen before include "Throw up, regurgitate" , "So rid egg? (anag)" , "yield under pressure" .)

I've seen this clue in the Sydney Morning Herald.
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