Two Florentine pieces once in circulation (6)
I believe the answer is:
florin
'two' is the definition.
The definition and answer can be both quantities as well as being singular nouns.
Maybe they are linked in a way I don't understand?
'florentine pieces once in circulation' is the wordplay.
I cannot quite see how this works, but
'in' is found in the answer.
The remaining letters 'flor' is a valid word which might be clued in a way I don't understand.
This may be the basis of clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for florin that I've seen before include "Former British silver coin" , "Pre-decimal coin" , "Old British (or Dutch) coin" , "ten pence" , "Old 2-shilling coin" .)