The most common and most likely answer to this crossword clue is the 5 letter word SPOOL
I've seen this crossword clue in The Guardian
S
P
O
O
L
More clues leading to the result SPOOL
Buddy explains!

The straight part
We know that "Cylinder" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cylinder = spool.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 SPOOL mean?
SPOOL noun- A reel; a device around which thread, wire or cable is wound, especially a cylinder or spindle.
- A temporary storage area for electronic mail, etc.
- To wind on a spool or spools.
- To send files to a device or a program (a spooler or a daemon that puts them in a queue for processing at a later time).
- A small swimming pool that can be used also as a spa.