Flyer, insured for a crash, works easily (4-8)
I believe the answer is:
user-friendly
'works easily' is the definition.
'flyer insured for a crash' is the wordplay.
'for a crash' indicates anagramming the letters (the same letters after a crash or being damaged).
'flyer'+'insured'='flyerinsured'
'flyerinsured' is an anagram of 'USER-FRIENDLY'.
(Other definitions for user-friendly that I've seen before include "Easy to understand or manipulate" , "Easy to operate" , "Easily picked up" .)