The most common and most likely answer to this crossword clue is the 8 letter word UNHOOKED
I've seen this crossword clue in The Daily Telegraph
U
N
H
O
O
K
E
D
Buddy explains!
The straight part
We know that "Disconnected" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case disconnected = unhooked.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 UNHOOKED mean?
UNHOOKED verb- To remove from a hook.
- To unfasten by means of hooks.
- To unfasten the bra of (its wearer).