Pilot ace through until war's end (7)
I believe the answer is:
aviator
'pilot' is the definition.
(I've seen this before)
'ace through until war's end' is the wordplay.
'ace' becomes 'a' (abbreviation).
'through' becomes 'via' (via means going through).
'until' becomes 'to' (I've seen this in other clues).
'war's end' becomes 'r' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'via'+'to'+'r'='AVIATOR'
Can you help me to learn more?
(Other definitions for aviator that I've seen before include "Pilot of plane" , "Ace, say," , "Aircraft pilot" , "He travels up" , "Navigator of the air" .)