Waste product (5)

I believe the answer is:

sweat

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'waste product' is the definition.
The answer and definition can be both acts as well as being singular nouns.
Maybe you can see an association between them that I don't see?

'waste product' is the wordplay.
'waste' anagrams to 'SWEAT'.
However, I am unsure how this is indicated.

Can you help me to learn more?

(Other definitions for sweat that I've seen before include "Toil" , "Waste (anag.)" , "Perspire" , "Salty fluid secreted by glands" , "Salty fluid secreted by the body" .)

I've seen this clue in the Evening Standard.

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