The most common and most likely answer to this crossword clue is the 11 plus 9 letter word FIBRE-OPTIC BROADBAND
I've seen this crossword clue in Independent
F
I
B
R
E
-
O
P
T
I
C
B
R
O
A
D
B
A
N
D
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.