Crossword Genius

Drifting on a shark boat with passengers from every other across answer (5,3)

Ross

I believe the answer is:

noahs ark

I'm a little stuck... Click here to teach me more about this clue!

'boat with passengers from every other across answer' is the definition.
I can't tell whether this definition defines the answer.

'drifting on a shark' is the wordplay.
'drifting' is an anagram indicator.
'on'+'a'+'shark'='onashark'
'onashark' with letters rearranged gives 'NOAHS ARK'.

Can you help me to learn more?

(Other definitions for noahs ark that I've seen before include "animal transport" , "Biblical ship" , "Transport ship" , "Great biblical boat" , "Old vessel" .)

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