Fined us unfairly for having made tea (7)

I believe the answer is:

infused

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'having made tea' is the definition.
I can't judge whether this definition defines the answer.

'fined us unfairly' is the wordplay.
'unfairly' is an anagram indicator (I've seen this in other clues).
'fined'+'us'='finedus'
'finedus' anagrammed gives 'INFUSED'.

'for' acts as a link.

Can you help me to learn more?

(Other definitions for infused that I've seen before include "Inculcated" , "as the tea maker did" , "as 27 [HERBAL TEA] did" , "poured in" , "Did steep" .)

I've seen this clue in the Evening Standard.

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