Crossword Genius

Get up and get undressed to get lighter (5)

Ross

I believe the answer is:

barge

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'lighter' is the definition.
(synonyms)

I don't understand the rest of the clue.

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(Other definitions for barge that I've seen before include "Canal-boat" , "Roughly push one's way" , "Freight vessel" , "Narrow boat" , "Flat-bottomed canal boat" .)

I've seen this clue in The Independent.
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