Good fortune for aviator (5)
I believe the answer is:
pilot
'aviator' is the definition.
(pilot is a kind of aviator)
'good fortune' is the wordplay.
'good' becomes 'pi' (I've seen this in other clues).
'fortune' becomes 'lot' ('lot' can be a synonym of 'fortune').
'pi'+'lot'='PILOT'
'for' acts as a link.
(Other definitions for pilot that I've seen before include "trial episode" , "Controller of aircraft" , "Plane flyer" , "Plane operator" , "One who brings a vessel into port" .)