Crossword Genius

Dissolved substances - use lots at work (7)

Ross

I believe the answer is:

solutes

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

Here is my best explanation:

'dissolved substances' is the definition.
Although both the answer and definition are plural nouns, I don't see how they can define each other.

'use lots at work' is the wordplay.
'at work' indicates an anagram.
'use'+'lots'='uselots'
'uselots' is an anagram of 'SOLUTES'.

Can you help me to learn more?