The most common and most likely answer to this crossword clue is the 6 letter word UNLINK
U
N
L
I
N
K
Buddy explains!
The straight part
We know that "Disconnect" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disconnect = unlink.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 UNLINK mean?
UNLINK noun- (knot theory) A link that is equivalent (under ambient isotopy) to finitely many disjoint circles in the plane.
- To decouple; to remove a link from, or separate the links of.
- To delete (a file).