The most common and most likely answer to this crossword clue is the 7 letter word OPTICAL
I've seen this crossword clue in Independent
O
P
T
I
C
A
L
More clues leading to the result OPTICAL
- Jerk splits stone, affecting his eyesight
- Choose independent state helping pupils work?
- Visual transformation of coal pit
- Visual movement in stone
- Visionarywork, Italian recalled, with unlimited scale
- Visual‘s up to date, putting operator first
- Capitol to be rebuilt from a visual perspective
- Drink dispenser needing a line of sight
- Visual changes made to Capitol
- Capitol out of sight
Buddy explains!

The straight part
We know that "Visionary" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case visionary = optical.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 OPTICAL mean?
OPTICAL adjective- Of, or relating to sight; visual.
- Designed to assist or enhance sight
- Of, or relating to optics.
- Of, or relating to visible light.
- Incorporating light-sensitive devices.