Water needed for us to finish work (3)

I believe the answer is:

usk

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'water' is the definition.
Both the definition and answer are singular nouns.
Perhaps you can see a link between them that I don't see?

'us to finish work' is the wordplay.
'to finish' says to take the final letters.
The final letter of 'work' is 'k'.
'us'+'k'='USK'

'needed for' acts as a link.

Can you help me to learn more?

(Other definitions for usk that I've seen before include "Newport's river" , "Welsh river (Caerleon)" , "Welsh river at Newport" .)

I've seen this clue in the Evening Standard.

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