The most common and most likely answer to this crossword clue is the 12 letter word DISASSEMBLEÂ
I've seen this crossword clue in The Guardian
D
I
S
A
S
S
E
M
B
L
E
Â
Buddy explains!

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 DISASSEMBLEÂ mean?
DISASSEMBLEÂ verb- To take to pieces; to reverse the process of assembly.
- To convert machine code to a human-readable, mnemonic form.