Very quick human, one entering draw shortly (10)

I believe the answer is:

supersonic

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'very quick' is the definition.
Both the answer and definition are adjectives. Maybe there's a link between them I don't understand?

'human one entering draw shortly' is the wordplay.
'human' becomes 'person' (synonyms).
'one' becomes 'i' (Roman numeral).
'entering' means one lot of letters goes inside another.
'draw shortly' becomes 'suc' (I can't explain this - if you can you should give a lot more credence to this answer).
'person'+'i'='personi'
'personi' put inside 'suc' is 'SUPERSONIC'.

Can you help me to learn more?

(Other definitions for supersonic that I've seen before include "Faster than Mach 1" , "Very fast - 11 (anag)" , "moving very fast" , "Faster than the speed of sound" .)

I've seen this clue in The Telegraph.

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