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Idiot limits chemical tests (10)

Ross

I believe the answer is:

titrations

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'chemical tests' is the definition.
The definition and answer can be both acts as well as being plural nouns.
Maybe there's an association between them I don't understand?

'idiot limits' is the wordplay.
'idiot' becomes 'tit' (both can mean a stupid person).
'limits' becomes 'rations' (rationing is a kind of limiting).
'tit'+'rations'='TITRATIONS'

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