Happy to be at the North Pole? (2,3,2,3,5)
I believe the answer is:
on top of the world
'happy' is the definition.
(I've seen this before)
'at the north pole?' is the wordplay.
'at' becomes 'on' (location).
'the north pole?' becomes 'topoftheworld' (I've seen this before).
'on'+'topoftheworld'='ON TOP OF THE WORLD'
'to be' acts as a link.
(Other definitions for on top of the world that I've seen before include "as a successful North Pole expedition?" , "as Hillary once was?" , "In seventh heaven" , "happy" , "as a polar bear, but not as a penguin?" .)