The most common and most likely answer to this crossword clue is the 8 letter word SCREWTOP
I've seen this crossword clue in The Times
S
C
R
E
W
T
O
P
More clues leading to the result SCREWTOP
- Cap in hands, stay outside
- Cap that is removed in its turn
- Man in check cap
- Asks crew to pull nets closer
- Bottle party during stay
- Prevent sailors breaking bottle
- Men in station like some bottles of beer?
- Arrest nabbing gang for ‘special cap’
- Salary cap — one’s on the bottle!
- Ship’s crew to pillage revealing kind of bottle
Buddy explains!

The straight part
We know that "Cap" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cap = screwtop.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 SCREWTOP mean?
SCREWTOP noun- A container that has a threaded lid (rather than a cork or push-on top).
- Of a container: having a threaded lid (rather than a cork or push-on top).