Get a man to become a business tycoon (7)
I believe the answer is:
magnate
'a business tycoon' is the definition.
(I've seen this in another clue)
'get a man to become' is the wordplay.
'to become' is an anagram indicator.
'get'+'a'+'man'='getaman'
'getaman' with letters rearranged gives 'MAGNATE'.
(Other definitions for magnate that I've seen before include "Important fellow" , "Baron" , "Fellow with a lot of money" , "Fat cat" , "Wealthy figure" .)