The most common and most likely answer to this crossword clue is the 7 letter word VIRTUAL
I've seen this crossword clue in The Times
V
I
R
T
U
A
L
Buddy explains!

The straight part
We know that "such reality" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case such reality = virtual.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 VIRTUAL mean?
VIRTUAL noun- A virtual member function of a class.
- In effect or essence, if not in fact or reality; imitated, simulated.
- Having the power of acting or of invisible efficacy without the agency of the material or measurable part; potential.
- Nearly, almost. (A relatively recent development in meaning)
- Simulated in a computer or online.
- Operating by computer or in cyberspace; not physically present.
- (of a class member) Capable of being overridden with a different implementation in a subclass.
- Pertaining to particles in temporary existence due to the Heisenberg uncertainty principle.