The most common and most likely answer to this crossword clue is the 9 letter word SCRAMBLER
I've seen this crossword clue in The Sunday Telegraph
S
C
R
A
M
B
L
E
R
Buddy explains!
The straight part
We know that "Bike/confusing device" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bike/confusing device = scrambler.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 SCRAMBLER mean?
SCRAMBLER noun- Someone or something that scrambles (in various senses).
- A vine that does not attach itself to its supports.
- A device that makes messages intentionally, but reversibly, unintelligible for reasons of privacy or security.
- A motorcycle used for motocross.