Start of aviation, once one's set? (4,4)
I believe the answer is:
nose cone
'start of aviation' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'once one's set?' is the wordplay.
'set?' indicates an anagram (instruction to set the letters).
'once'+'ones'='onceones'
'onceones' anagrammed gives 'NOSE-CONE'.
Can you help me to learn more?
(Other definitions for nose cone that I've seen before include "Challenger at the front" , "Front section of spacecraft" , "Pointed front of missile" , "Front part of a spacecraft, etc" , "Front of rocket" .)