Licensed church member, top person around Scottish port (3,6)
I believe the answer is:
lay reader
'licensed church member' is the definition.
(someone licensed to carry out some church services)
'top person around scottish port' is the wordplay.
'top person' becomes 'leader' (person at the top).
'around' is an insertion indicator.
'scottish port' becomes 'ayr' (Ayr is a Scottish port town).
'leader' enclosing 'ayr' is 'LAY READER'.
(Other definitions for lay reader that I've seen before include "volunteer for service?" , "licensee in church" , "Churchman" , "Minister's assistant" , "who carries out some services" .)