Heard Asian firm supported by magnate (6)
I believe the answer is:
tycoon
'magnate' is the definition.
(I know that magnate can be written as tycoon)
'heard asian firm supported by' is the wordplay.
'heard asian' becomes 'ty' (I can't explain this - if you can you should believe this answer much more).
'firm' becomes 'co' (abbreviation for company).
'supported by' becomes 'on' (something on something else is supported by it).
'ty'+'co'+'on'='TYCOON'
Can you help me to learn more?
(Other definitions for tycoon that I've seen before include "Entrepreneur" , "Rich businessperson" , "Magnate, wealthy businessman" , "Big businessman" , "Rich powerful person" .)