A random charge on port (9)
I believe the answer is:
anchorage
'port' is the definition.
(I've seen this before)
'a random charge on' is the wordplay.
'random' indicates an anagram.
'charge'+'on'='chargeon'
'chargeon' with letters rearranged gives 'nchorage'.
'a'+'nchorage'='ANCHORAGE'
(Other definitions for anchorage that I've seen before include "source of security" , "Place for ship to rest securely, and Alaskan seaport" , "place to moor vessel" , "where you might fnd a refuge" , "Safe place for ship; Alaskan city" .)