Boat in which to intrude, perhaps (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 "Sort of board" , "Flat-bottomed canal boat" , "Cargo vessel" , "Move roughly; boat" , "Shove - canal boat" .)

I've seen this clue in The Irish News.

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