Crossword Genius

Vessel - lacking stabilisers? (7)

Ross

I believe the answer is:

pitcher

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

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for pitcher that I've seen before include "source of drink?" , "One throwing" , "American sportsman" , "that can hold his drink" , "Baseball thrower or water jug" .)

I've seen this clue in The Irish News.
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