Crossword Genius

They focus here, finally, certainly taking in church after confusion (9)

Ross

I believe the answer is:

eyepieces

'they focus' is the definition.

I cannot understand how the remainder of the clue works.

I've seen this clue in The Independent.
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.