Crossword Genius

Not keen for seconds of walnut dip? (4)

Ross

I believe the answer is:

anti

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'not' is the definition.
(I've seen this in other clues)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for anti that I've seen before include "Against, informally" , "(Person who is) not in favour" , "Prefix meaning against" , "[NO MAN]" , "Opposed to followers of Hitler" .)

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