Crossword Genius

Vessel - lacking stability? (7)

Ross

I believe the answer is:

pitcher

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

This clue could be a double definition.

'vessel' is the first definition.
(I know that pitcher is a type of jar)

'lacking stability?' is the second definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

Can you help me to learn more?

(Other definitions for pitcher that I've seen before include "Baseball bowler and vessel for liquid" , "American player" , "Ewer" , "Earthenware jug" , "Large jug; thrower" .)

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