The most common and most likely answer to this crossword clue is the 6 letter word MAGNUM
I've seen this crossword clue in The Times
M
A
G
N
U
M
More clues leading to the result MAGNUM
- Large amount of red or white antelope marks on the mother
- Mother keeps silver with note in bottle
- Monthly, perhaps, miners getting large bottle
- Bottle Geordie’s mother shows, catching large antelope (6
- Chap grabs glass that girl’s left: I’m not sure there’s much wine in it
- Bottle that may be full of slugs
- Mother saving silver and note inside large bottle
- Mother grabs a gunman’s extremities, showing a lot of bottle
- Relative trapping animal in bottle
- Parent drinks a gin, disposing of one big bottle
Buddy explains!

The straight part
We know that "Bottle/that may be full of slugs" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case bottle/that may be full of slugs = magnum.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 MAGNUM mean?
MAGNUM noun- A bottle of wine containing 1.5 liters of fluid, double the volume of a standard bottle.
- A powerful firearm cartridge, often derived from a shorter, less powerful cartridge calibre that uses the same bullet.
- A handgun that fires a cartridge of this calibre; chiefly a revolver, but rarely an autoloader firing an unusually powerful calibre.