A less-ponderous barge (7)

I believe the answer is:

lighter

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'barge' is the definition.
(synonyms)

I cannot understand how the rest of the clue works.

(Other definitions for lighter that I've seen before include "carrying less cargo?" , "more blonde" , "Barge - alternative to match" , "Smoking accessory" , "that leads the way for others?" .)

I've seen this clue in the Sydney Morning Herald.

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