Crossword Genius

African Christian’s missing start of vision (5)

Ross

I believe the answer is:

optic

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

'of vision' is the definition.
(I've seen this in another clue)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for optic that I've seen before include "Eye - spirit measure" , "Teacher's maybe coming through this" , "affecting vision?" , "Ocular" , "bar assistant" .)

Want a hint initially instead of a full solution? Install my app