Powerful businessman (5)
'powerful businessman' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for tycoon that I've seen before include "Rich businessperson" , "Business magnate or mogul" , "Magnate, wealthy businessman" , "See 2" , "Captain of industry" .)
(Other definitions for cogent that I've seen before include "Compelling or convincing" , "'Powerfully persuasive, argument say (6)'" , "Convincingly argued" , "Clearly argued" , "Well-reasoned" .)
'powerful businessman' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for baron that I've seen before include "captain of industry" , "Powerful industrialist" , "Born a (anagram) - powerful man of business" , "British peer; business mogul" , "Member of the nobility" .)