For which the water was hot? (4)

I believe the answer is:

wash

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

'was hot?' is the wordplay.
'hot?' becomes 'h' (abbreviation eg on taps).
'was'+'h'='WASH'

Can you help me to learn more?

(Other definitions for wash that I've seen before include "Clean with water" , "Perform ablutions" , "Clean; dilute coat" , "The ----, inlet of the North Sea" , "Clean; thin coat of paint" .)

I've seen this clue in the Evening Standard.

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