Pilot coming from Ottawa, via Toronto (7)
I believe the answer is:
aviator
'pilot' is the definition.
(thesaurus)
'coming from ottawa via toronto' is the wordplay.
'coming from' says the answer is hidden in the clue.
'AVIATOR' is hidden within 'ottawa via toronto'.
(Other definitions for aviator that I've seen before include "Flyer, pilot" , "Pilot of plane" , "He travels up" , "Navigator of the air" , "Ace, say," .)