Crossword Genius

Mistake to drop item from petition (3)

Ross

I believe the answer is:

ask

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'petition' is the definition.
(thesaurus)

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

Can you help me to learn more?

(Other definitions for ask that I've seen before include "Inquire" , "Issue invitations" , "Seek an answer" , "Invite (to a party)" , "Enquire" .)

I've seen this clue in the Irish Times (Crosaire) and the Irish Times.
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