The most common and most likely answer to this crossword clue is the 5 letter word OPTIC
I've seen this crossword clue in The Times
O
P
T
I
C
More clues leading to the result OPTIC
- Stop ticket-collector? That shows some nerve
- Through which spirit is poured out of sight
- Surgical procedure overcoming twitching of the eye
- Work leading to convulsive movement of the eye
- Bar measure? Ring officer about it going up
- Eye work that gets a lot of credit
- Choose one colour, primarily, for drinks dispenser
- Procedure over involuntary movement of the eye
- Choose to get most of ice for drink dispenser
- Eye surgery to itch from time to time
Buddy explains!

The straight part
We know that "of the eye" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case of the eye = optic.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does OPTIC mean?
OPTIC noun- An eye.
- A lens or other part of an optical instrument that interacts with light.
- A measuring device with a small window, attached to an upside-down bottle, used to dispense alcoholic drinks in a bar.
- Of, or relating to the eye or to vision.
- Of, or relating to optics or optical instruments.