Theologian at home visiting disreputable club (6)
I believe the answer is:
divine
'theologian' is the definition.
(thesaurus)
'home visiting disreputable club' is the wordplay.
'home' becomes 'in' ('he's home' can mean 'he's in').
'visiting' means one lot of letters goes inside another.
'disreputable club' becomes 'dive'.
'in' going inside 'dive' is 'DIVINE'.
'at' is the link.
(Other definitions for divine that I've seen before include "Apprehend" , "Godlike (6" , "Like a god; delightful" , "Godly or celestial" , "Supreme" .)