Lighter game (7)

I believe the answer is:

pontoon

I believe this is a double definition.

'lighter' is the first definition.
(pontoon is a kind of lighter)

'game' is the second definition.
(I've seen this before)

(Other definitions for pontoon that I've seen before include "Card game - type of bridge" , "Card game; floating support" , "Bridge of boats" , "Half of 1D [GAME OR BIRD]" , "Lighter" .)

I've seen this clue in The Times and The Independent.

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