Crossword Genius

Swap farthings and threepenny bits? (8)

Ross

I believe the answer is:

exchange

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'swap' is the definition.
(I've seen this before)

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

Can you help me to learn more?

(Other definitions for exchange that I've seen before include "Convert" , "Altercation" , "Price of one currency in another" , "Substitute" , "Give one thing and get another back" .)

I've seen this clue in The Times.
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