As top man, he gets a bit of publicity (4)
I believe the answer is:
head
'as top man' is the definition.
'head' can be an answer for 'man' (thesaurus). I'm not sure about the 'as top' bit.
'he gets a bit of publicity' is the wordplay.
'gets' is a charade indicator (letters next to each other).
'a bit of publicity' becomes 'ad' (short for advert).
'he'+'ad'='HEAD'
Can you help me to learn more?
(Other definitions for head that I've seen before include "bean" , "Beer foam; front" , "Noggin" , "Leader; stream source" , "Skull" .)