In conclusion, it sounds foreign (6)

I believe the answer is:

finish

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'in conclusion' is the definition.
'finish' can be an answer for 'conclusion' (synonyms). I'm not certain of the 'in' bit.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for finish that I've seen before include "Treatment of surface" , "Perfect" , "End or terminus" , "End, conclusion" , "Culminate" .)

I've seen this clue in the Evening Standard.

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