Cryptic crossword clue
Optical effect as normal: a line without focus? 8

The most common and most likely answer to this crossword clue is the 8 letter word PARALLAX

I've seen this crossword clue in The Times
P
A
R
A
L
L
A
X

Buddy explains!

The straight part
We know that "Optical effect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case optical effect = parallax.
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 PARALLAX mean?

PARALLAX noun
  1. An apparent shift in the position of two stationary objects relative to each other as viewed by an observer, due to a change in observer position.
  2. The angle of seeing of the astronomical unit.
PARALLAX verb
  1. To measure (a distance) based on parallax observations.
  2. To produce an illusion of levels of distance by shifting layers at different rates.

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