Crossword Genius

Sweat is such a product (5)

Ross

I believe the answer is:

waste

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

'a product' is the definition.
The answer and definition can be both substances as well as being singular nouns.
Maybe they are linked in a way I don't understand?

'sweat is' is the wordplay.
'sweat' can be anagrammed to 'WASTE'.
Though, I'm not sure how this is indicated.

'such' acts as a link.

Can you help me to learn more?

(Other definitions for waste that I've seen before include "Fail to use (profitably)" , "Become gradually weaker" , "unused" , "Misuse" , "Barren area; rubbish" .)

I've seen this clue in the Evening Standard.
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