The most common and most likely answer to this crossword clue is the 10 letter word LAVATORIES
I've seen this crossword clue in The Times
L
A
V
A
T
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More clues leading to the result LAVATORIES
Buddy explains!

The straight part
We know that "More than one can" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case more than one can = lavatories.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 LAVATORIES mean?
LAVATORIES noun- A vessel or fixture for washing, particularly:
- Handwashing, particularly
- A liquid used in washing; a lotion; a wash; a rinse.
- A washroom: a room used for washing the face and hands.
- A room containing a toilet: a bathroom (US) or WC (UK).
- A plumbing fixture for urination and defecation: a toilet.
- A place to wash clothes: a laundry.
- A place where gold is panned.
- A paved room in a mortuary where corpses are kept under a shower of disinfecting fluid.