Crossword Genius

It was a somewhat unsound currency (3)

Ross

I believe the answer is:

sou

I'm a little stuck... Click here to teach me more about this clue!

'it' is the definition.
The definition suggests a singular noun which matches the answer.

'a somewhat unsound currency' is the wordplay.
'a somewhat' indicates a hidden word.
'SOU' is hidden within 'unsound currency'.

'was' acts as a link.

Can you help me to learn more?

(Other definitions for sou that I've seen before include "Little money once" , "French bread once" , "Very small amount of money" , "Tiny amount of money" , "Old French monetary unit" .)

I've seen this clue in The Globe and Mail.
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