Crossword Genius

Lighters that need water (6)

Ross

I believe the answer is:

barges

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'lighters' is the definition.
('barge' can be a synonym of 'lighter')

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for barges that I've seen before include "Canal and river boats" , "Long boats on inland waterways" , "Broad flat-bottomed boats" , "Flat-bottomed boats for carrying loads" , "Inland waterway longboats" .)

I've seen this clue in the Evening Standard.
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