See Croat jet crashing? This could be used! (7,4)
I believe the answer is:
ejector seat
'this could be used' is the definition.
The definition suggests a singular noun which matches the answer.
'see croat jet crashing?' is the wordplay.
'crashing?' indicates anagramming the letters.
'see'+'croat'+'jet'='seecroatjet'
'seecroatjet' with letters rearranged gives 'EJECTOR-SEAT'.
Can you help me to learn more?
(Other definitions for ejector seat that I've seen before include "Warplane escape mechanism" , "Pilot's emergency device" , "Device for a pilot who wants to depart quickly!" , "It throws pilot to safety" , "Emergency escape mechanism" .)