Art of growing miniature trees (6)
I believe the answer is:
bonsai
'art of growing miniature trees' is the definition.
(I've seen this before)
This is the entire clue.
(Other definitions for bonsai that I've seen before include "Japanese art of growing dwarfed trees" , "Bosnia (anag.)" , "Japanese art of growing miniature trees" , "Japanese craft of growing dwarf trees" , "stunted growth" .)