From after ascent, aunt's become queasy in jet (8)
I believe the answer is:
fountain
'jet' is the definition.
(I know that jet can be written as fountain)
'from after ascent aunt's become queasy' is the wordplay.
I cannot really understand how this works, but
'from' could be 'in' (I've seen this in other clues) and 'in' is located in the answer.
an anagram of 'aunt' is 'unta' which is located in the answer.
This may be the basis of the clue (or it may be nonsense).
'in' acts as a link.
Can you help me to learn more?
(Other definitions for fountain that I've seen before include "Man-made water-jet" , "Ornamental water-jet" , "Spurt" , "Give out" , "Man-made jet of water" .)