That man has control at this place (6)
I believe the answer is:
herein
'at this place' is the definition.
Both the answer and definition are adverbs. Maybe you can see a link between them that I can't see?
'that man has control' is the wordplay.
'that man' becomes 'he' (he refers to a man).
'has' is a charade indicator (letters next to each other).
'control' becomes 'rein' (reining is a kind of controlling).
'he'+'rein'='HEREIN'
Can you help me to learn more?
(Other definitions for herein that I've seen before include "In this book" , "in this place" , "Contained in this document" .)