Unsettled when flying (2,3,3)
I believe the answer is:
in the air
I believe this is a double definition.
'unsettled' is the first definition.
(I've seen this before)
'flying' is the second definition.
(I've seen this before)
'when' is the link.
(Other definitions for in the air that I've seen before include "Uncertain" , "a possibility" , "travelling on a jumbo?" , "Flying around currently" , "Place for a lark" .)