Swiss currency (5)

I believe the answer is:

franc

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

This is the entire clue.

(Other definitions for franc that I've seen before include "Ex-Gallic coin" , "Swiss capital" , "Foreign currency" , "Unit of money" , "Old European currency" .)

I've seen this clue in The Telegraph, The Sun, The New York Times, the Universal and The Times.

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