The most common and most likely answer to this crossword clue is the 12 letter word MOTHERBOARDS
I've seen this crossword clue in The Daily Telegraph
M
O
T
H
E
R
B
O
A
R
D
S
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 MOTHERBOARDS mean?
MOTHERBOARDS noun- The primary circuit board of a personal computer, containing the circuitry for the central processing unit, keyboard, mouse and monitor, together with slots for other devices.