Confounded sailing! (2,3)
I believe the answer is:
at sea
I believe this is a double definition.
'confounded' is the first definition.
('at sea' can be a synonym of 'confounded')
'sailing' is the second definition.
('at sea' can be a synonym of 'sailing')
(Other definitions for at sea that I've seen before include "Puzzled" , "Sailing on a ship?" , "Bewildered on the ocean?" , "stumped" , "Might marines be" .)