On the surface a pontoon (6)

I believe the answer is:

afloat

'on the surface' is the definition.
(I've seen this before)

'a pontoon' is the wordplay.
'pontoon' becomes 'float' (I've seen this in another clue).
'a'+'float'='AFLOAT'

(Other definitions for afloat that I've seen before include "On board a ship or boat" , "Bobbing along?" , "Resting on water" , "At sea, drifting aimlessly" , "Borne on the water" .)

I've seen this clue in The Globe and Mail.

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