Magnate to pull up after Maureen (5)
I believe the answer is:
mogul
'magnate' is the definition.
(thesaurus)
'pull up after maureen' is the wordplay.
'pull' becomes 'lug' (I've seen this before).
'up' says the letters should be written in reverse (in down clue: letters go upwards).
'after' is a charade indicator (letters next to each other).
'maureen' becomes 'mo' (I've seen this in other clues).
'lug' backwards is 'gul'.
'gul' put after 'mo' is 'MOGUL'.
'to' is the link.
(Other definitions for mogul that I've seen before include "Powerful person, potentate" , "Powerful man" , "bigwig" , "Bashaw" , "Powerful businessperson" .)