Crossword Genius

Polish is the spoken language of the Baltic (6)

Ross

I believe the answer is:

finish

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

'polish' is the definition.
(as in polishing or finishing a surface)

'is the spoken language of the baltic' is the wordplay.
I cannot quite understand how this works, but
'is' is present in the answer.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for finish that I've seen before include "Patina" , "perfection" , "Bring to an end" , "Bring to an close" , "Come to an end" .)

I've seen this clue in the Sydney Morning Herald.
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