They're wrong to take in the girl (8)

I believe the answer is:

mistakes

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'they're wrong' is the definition.
The definition suggests an adverb but the answer is not.

'take in the girl' is the wordplay.
'in the' indicates putting letters inside.
'girl' becomes 'miss' (term of address for an unmarried woman).
'take' placed into 'miss' is 'MISTAKES'.

'to' is the link.

Can you help me to learn more?

(Other definitions for mistakes that I've seen before include "Misguided or wrong acts" , "Errors" , "Blunders, slips" .)

I've seen this clue in the Evening Standard.

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