A manly sort of person who isn't an expert (6)
I believe the answer is:
layman
'person who isn't an expert' is the definition.
'a manly sort' is the wordplay.
'sort' is an anagram indicator.
'a'+'manly'='amanly'
'amanly' with letters rearranged gives 'LAYMAN'.
'of' is the link.
(Other definitions for layman that I've seen before include "He is a non-professional or a non-cleric" , "He's not a priest or specialist" , "Person without specialised knowledge of subject" , "Non-professional male" , "He's not a cleric" .)