Crossword Genius

Vessel that had a full complement of mates (3)

Ross

I believe the answer is:

ark

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'vessel' is the definition.
(ark is a kind of vessel)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for ark that I've seen before include "The earliest vessel?" , "Coffer" , "Rescue boat" , "Boat built to withstand great flood" , "Noah's vessel - in which the Torah scrolls are kept" .)

I've seen this clue in The Globe and Mail.
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