A snooty type upset over current style of Japanese art (6)
I believe the answer is:
bonsai
'japanese art' is the definition.
(I've seen this before)
'a snooty type upset over current' is the wordplay.
'snooty type' becomes 'snob' (snobs are snooty or superior).
'upset over' says the letters should be written in reverse (knocked over).
'current' becomes 'I' (symbol for electric current).
'a'+'snob'='asnob'
'asnob' in reverse letter order is 'bonsa'.
'bonsa'+'i'='BONSAI'
'style of' acts as a link.
This may not be correct. Some or all of it may belong to another bit of the clue.
Can you help me to learn more?
(Other definitions for bonsai that I've seen before include "Art of dwarfing shrubs" , "Japanese art of growing dwarf trees" , "The art of growing ornamental dwarfed plants" , "Japanese method of growing miniature plants" , "Art of growing dwarf varieties of tree" .)