Tycoon has tea with G-man arranged (7)
I believe the answer is:
magnate
'tycoon' is the definition.
(I know that tycoon can be written as magnate)
'tea with g-man arranged' is the wordplay.
'with' is a charade indicator (letters next to each other).
'arranged' indicates an anagram.
'tea'+'g'+'man'='teagman'
'teagman' with letters rearranged gives 'MAGNATE'.
'has' acts as a link.
(Other definitions for magnate that I've seen before include "Fellow with a lot of money" , "Mogul" , "Wealthy business leader" , "Fat cat" , "Baron" .)