Card game or flat-bottomed boat not on op strangely (7)

I believe the answer is:

pontoon

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'card game' is the definition.
(pontoon is a card game)

'not on op strangely' is the wordplay.
'strangely' is an anagram indicator.
'not'+'on'+'op'='notonop'
'notonop' with letters rearranged gives 'PONTOON'.

'or flat-bottomed boat' is the link.
I am not very happy about this link. Some or all of it may belong to another bit of the clue.

Can you help me to learn more?

(Other definitions for pontoon that I've seen before include "Card game - type of bridge" , "Card-game" , "Vingt-et-un" , "Lighter" , "Half of 1D [GAME OR BIRD]" .)

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

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