Don't buy, that is, from shifty Leslie (4)

I believe the answer is:

sell

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'don't buy' is the definition.
The answer and definition can be both to do with ownership as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for sell that I've seen before include "Decorative edging" , "disappointment?" , "Vend, auction off" , "Give up for a price" , "Trade" .)

I've seen this clue in the Evening Standard.

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