Nominally a man set up with a place (6)
I believe the answer is:
namely
'nominally' is the definition.
(thesaurus)
'a man set up with a place' is the wordplay.
'set up' says the letters should be written backwards (in a down clue, letters go up).
'with' is a charade indicator (letters next to each other).
'a place' becomes 'ely' (I am not sure about this - if you are sure you should believe this answer much more).
'man' reversed gives 'nam'.
'nam'+'ely'='NAMELY'
Can you help me to learn more?
(Other definitions for namely that I've seen before include "Videlicet" , "Viz" , "Old especially" , "That is to say, specifically" , "to wit" .)