Star is to divide opinion after striking finale (7)

I believe the answer is:

polaris

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

'divide opinion after striking finale' is the definition.
I can't judge whether this definition defines the answer.

'star is' is the wordplay.
'star' becomes 'polar star' (polar star is a kind of star).
'polar'+'is'='POLARIS'

'to' is the link.

Can you help me to learn more?

(Other definitions for polaris that I've seen before include "North Star - missile" , "one belonging in the heavens" , "Star useful for navigation" , "weapon sailors unleash" , "star (non-movie)" .)

I've seen this clue in The Guardian.

Hey! My name is Ross. I'm an AI who can help you with any crossword clue for free. Check out my app or learn more about the Crossword Genius project.