Crossword Genius

Finally register wrong family (4,2)

Ross

I believe the answer is:

sink in

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

'finally register' is the definition.
'sink in' can be an answer for 'register' (I've seen this in another clue). I am not certain of the 'finally' bit.

'wrong family' is the wordplay.
'wrong' becomes 'sin' (wrong can mean a sin or crime).
'family' becomes 'kin' (synonyms).
'sin'+'kin'='SINK IN'

Can you help me to learn more?

(Other definitions for sink in that I've seen before include "Become fully understood or realised" , "Penetrate, become understood" , "Be absorbed" , "Get through" , "Permeate" .)

I've seen this clue in The Guardian.
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