Notice that man getting regular payment is hanger-on (8)
I believe the answer is:
adherent
'is hanger-on' is the definition.
(thesaurus)
'notice that man getting regular payment' is the wordplay.
'notice' becomes 'ad'.
'that man' becomes 'he'.
'getting' says to put letters next to each other.
'regular payment' becomes 'rent' (rent is a kind of regular payment).
'ad'+'he'+'rent'='ADHERENT'
(Other definitions for adherent that I've seen before include "supporter of party" , "Freak" , "Loyal follower, one who sticks" , "Disciple, follower" , "Sticking; partisan" .)