Ground or monkey e.g. (6)

I believe the answer is:

peanut

(Other definitions for peanut that I've seen before include "One of little importance -- ante up (anag)" , "Groundnut" , "Seed also known as a goober" , "Ante up for this type of hard fruit" , "Edible seed of a leguminous plant" .)

I've seen this clue in The Guardian.

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