Cryptic crossword clue
Idiots need keycode to sit on ship’s toilet 8

The most common and most likely answer to this crossword clue is the 8 letter word PINHEADS

I've seen this crossword clue in Financial Times
P
I
N
H
E
A
D
S

Buddy explains!

The straight part
We know that "Idiots" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case idiots = pinheads.
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 PINHEADS mean?

PINHEADS noun
  1. The head of a pin. (Frequently used in size comparisons.)
  2. An ignorant, naive, foolish, or stupid person.
  3. A telemark skier.
  4. A human head that is unusually tapered or small, often due to microcephaly, or a person with that trait. Often promoted in freak shows as "human pinheads".
  5. (pet stores) A newborn cricket used as food for pets.
  6. (mycoculture) The immature juvenile fruiting body of a mushroom prior to its gills opening.

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