Crossword Genius

Greeny-yellow mucus after wiping top of sleeve (4)

Ross

I believe the answer is:

lime

'greeny-yellow' is the definition.
(greeny-yellow colour)

I don't understand the rest of the clue.

(Other definitions for lime that I've seen before include "Caustic calcium" , "Kind of tree or substance used in cement" , "Another name for the linden tree" , "Tree; alkali" , "Green fruit -- green colour" .)

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