The most common and most likely answer to this crossword clue is the 5 letter word TUBED
I've seen this crossword clue in Independent
T
U
B
E
D
Buddy explains!

The straight part
We know that "Cylindrical" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cylindrical = tubed.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 TUBED mean?
TUBED verb- To supply with, or enclose in, a tube.
- To ride an inner tube.
- To intubate.
- Possessing a tube or tubes.