Pontoon game? (6)
I believe the answer is:
bridge
This could be a double definition.
'pontoon' is the first definition.
The definition and answer can be both man-made objects as well as being singular nouns.
Perhaps you can see a link between them that I can't see?
'game?' is the second definition.
(card game)
Can you help me to learn more?
(Other definitions for bridge that I've seen before include "Bony upper part of nose; card game" , "Span, connecting structure" , "Structure spanning a divide" , "Crossing point" , "Card game - pontoon - couple" .)