Cryptic crossword clue
Bloody lavatory emptied once in a blue moon 6

The most common and most likely answer to this crossword clue is the 6 letter word RARELY

I've seen this crossword clue in Independent
R
A
R
E
L
Y


Buddy explains!

The straight part
We know that "once in a blue moon" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case once in a blue moon = rarely.
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 RARELY mean?

RARELY adverb
  1. Not occurring at a regular interval; seldom; not often.
  2. Unusually well; excellently.
  3. To a rare degree; very.

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