Barge in, spilling gin with shoulder (4)

I believe the answer is:

bear

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'shoulder' is the definition.
(I've seen this before)

I don't understand the rest of the clue.

(Other definitions for bear that I've seen before include "Carry; large mammal" , "Beast - tolerate" , "Ursine - carry" , "Harbour - transport" , "Abide; support" .)

I've seen this clue in the Irish Times and the Irish Times (Crosaire).

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