Crossword Genius

Harry gave me £1 (4)

Ross

I believe the answer is:

lime

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'harry' is the definition.
Although both the answer and definition are verbs in their base form, I can't see how they can define each other.

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

Can you help me to learn more?

(Other definitions for lime that I've seen before include "Another name for the linden tree" , "Having no money" , "Caustic calcium" , "Kind of tree or substance used in cement" , "Acidic citrus fruit" .)

I've seen this clue in the Evening Standard.
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