Small flame can make aviator dismount (5,5)
I believe the answer is:
pilot light
'small flame' is the definition.
(I've seen this before)
'aviator dismount' is the wordplay.
'aviator' becomes 'pilot' (pilot is a kind of aviator).
'dismount' becomes 'light' (synonyms).
'pilot'+'light'='PILOT LIGHT'
'can make' acts as a link.
(Other definitions for pilot light that I've seen before include "gas burner" , "It burns all the time" , "Burning 27 [GAS]" , "Small flame" , "what should always be on" .)