Crossword Genius

Swap shillings and farthings? (8)

Ross

I believe the answer is:

exchange

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

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for exchange that I've seen before include "Convert" , "Short conversation or argument" , "place of business" , "Brief argument" , "'Swap, trade (8)'" .)

I've seen this clue in The Independent.
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