Fly high around the pole, with navigational aid (5)
I believe the answer is:
sonar
'navigational aid' is the definition.
(I've seen this in another clue)
'fly high around the pole' is the wordplay.
'fly high' becomes 'soar' (I've seen this in another clue).
'around' indicates putting letters inside.
'the pole' becomes 'n' (abbreviation for North, as in North Pole).
'soar' enclosing 'n' is 'SONAR'.
'with' is the link.
(Other definitions for sonar that I've seen before include "Locating device" , "Underwater echo sounder" , "Underwater detection system" , "Undersea sensing system" , "Underwater navigation device" .)