Art of growing up among Asia's nobility (6)
I believe the answer is:
bonsai
'art' is the definition.
(I know that bonsai is a art)
'growing up among asia's nobility' is the wordplay.
'growing up' shows that the letters should be reversed in order.
'among' says the answer is hidden in the clue.
'iasnob' is hidden within 'asias nobility'.
'iasnob' back-to-front is 'BONSAI'.
'of' is the link.
(Other definitions for bonsai that I've seen before include "Mini-tree growing" , "The art of growing ornamental dwarfed plants" , "Japanese shrub" , "Dwarf tree cultivation" , "Potted tree or shrub artificially prevented from reaching normal size" .)