Crossword Genius

Fits up local employed by the opticians (6)

Ross

I believe the answer is:

frames

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

'fits' is the definition.
The definition and answer can be both to do with fundamental existence as well as being verbs in their -s form.
Perhaps there's an association between them I don't understand?

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for frames that I've seen before include "Supporting or surrounding structures" , "Borders, around pictures say" , "Rounds of snooker play, or spectacles structures" .)

I've seen this clue in the Irish Times.
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