Go rudely in, uninvited, to the boat (5)

I believe the answer is:

barge

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'boat' is the definition.
(I know that barge is a type of boat)

I don't understand the rest of the clue.

(Other definitions for barge that I've seen before include "Canal boat, towed along (5)" , "Possibly lighter" , "Push - boat" , "Wide, flat-bottomed boat" , "Bump" .)

I've seen this clue in the Evening Standard.

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