Yields a dollar to the boy (7)

I believe the answer is:

buckles

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'yields' is the definition.
The answer and definition can be both man-made objects as well as being plural nouns.
Perhaps you can see a link between them that I can't see?

'a dollar to the boy' is the wordplay.
'a dollar' becomes 'buck' (slang).
'to the boy' becomes 'les' (short for Leslie).
'buck'+'les'='BUCKLES'

Can you help me to learn more?

(Other definitions for buckles that I've seen before include "Belt fasteners" , "damages" , "Secures" , "Clips for fastening belts" .)

I've seen this clue in the Evening Standard.

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