Betrothal that a fighter pilot might look forward to during wartime (10)
I believe the answer is:
engagement
'betrothal' is the definition.
(synonyms)
I don't understand the remainder of the clue.
Can you help me to learn more?
(Other definitions for engagement that I've seen before include "get this in the diary?" , "promise of union" , "pledge between 11 & 6 [WILLIAM & KATE]" , "Commitment to marriage" , "before wedding" .)