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lb1, once more, is foreign money! (4)

Ross

I believe the answer is:

lire

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'foreign money' is the definition.
(Italian currency 1861-2002)

'lb1 once more' is the wordplay.
'lbl' becomes 'li' (I can't justify this - if you can you should give a lot more credence to this answer).
'once more' becomes 're' (prefix in words like 're-emerge' or 're-enter').
'li'+'re'='LIRE'

'is' is the link.

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I've seen this clue in the Evening Standard.
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