Vessel not encountered in a market (3)

I believe the answer is:

ark

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

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

'not encountered in a market' is the wordplay.
'ARK' is hidden in amongst the letters.
But, I am not sure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for ark that I've seen before include "Ship built by Noah" , "-- of the Covenant" , "Coffer" , "protection for couples that rose in bad weather" , "Ancient shelter" .)

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

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