Crossword Genius

Start of aviation, once one's set? (4,4)

Ross

I believe the answer is:

nose cone

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'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" .)

I've seen this clue in The Mirror.
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