Lord perhaps having a way to open port (6)
I believe the answer is:
aristo
'lord perhaps' is the definition.
(lord is a type of aristocrat)
'a way to open port' is the wordplay.
'way' becomes 'st'.
'to open' is an insertion indicator (some letters create an opening in a word).
'port' becomes 'rio' (I've seen this before).
'st' going inside 'rio' is 'risto'.
'a'+'risto'='ARISTO'
'having' acts as a link.
(Other definitions for aristo that I've seen before include "Nob" , "Noble (abbrev.)" , "Member of the nobility (abbr)" , "Owned by the state" , "privileged individual" .)