The most common and most likely answer to this crossword clue is the 8 letter word DISCRETE
I've seen this crossword clue in The Times
D
I
S
C
R
E
T
E
More clues leading to the result DISCRETE
- Separated daughter on island, Greek one
- Verbally restrained individual
- Separate set cried to be put together
- Separate record and notes
- Unattached police on island
- South of Land’s End, is island separate?
- Man returned to island unattached
- Individual is tactful on the phone
- Separate, hellish destination holiday island
- Separate from backward lad on Mediterranean island
Buddy explains!

The straight part
We know that "Separate" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case separate = discrete.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 DISCRETE mean?
DISCRETE adjective- Separate; distinct; individual; non-continuous.
- That can be perceived individually and not as connected to, or part of something else.
- Having separate electronic components, such as individual diodes, transistors and resisters, as opposed to integrated circuitry.
- (audio engineering) Having separate and independent channels of audio, as opposed to multiplexed stereo or quadraphonic, or other multi-channel sound.
- Having each singleton subset open: said of a topological space or a topology.
- Disjunctive; containing a disjunctive or discretive clause.