Crossword Genius

Fruit in slippery gunk, initially wiped (4)

Ross

I believe the answer is:

lime

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'fruit' is the definition.
(lime is a kind of fruit)

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for lime that I've seen before include "Caustic calcium" , "Green fruit -- green colour" , "Having no money" , "Tree, linden or citrus" , "Bright light green" .)

I've seen this clue in The Guardian.
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