It was somewhat unsound currency (3)

I believe the answer is:

sou

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

'somewhat unsound currency' is the wordplay.
'somewhat' indicates a hidden word.
'SOU' can be found hidden inside 'unsound currency'.

'was' acts as a link.

Can you help me to learn more?

(Other definitions for sou that I've seen before include "Something of little worth" , "Tiny amount of money" , "Former French coin of low value" , "Old French coin of little value" , "Old French monetary unit" .)

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

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