After end of red, finished port... (5)
I believe the answer is:
dover
'port' is the definition.
(I've seen this before)
'after end of red finished' is the wordplay.
'after' is a charade indicator (letters next to each other).
'end of' says to take the final letters.
'finished' becomes 'over' ('over' can be similar in meaning to 'finished').
The last letter of 'red' is 'd'.
'd' put next to 'over' is 'DOVER'.
(Other definitions for dover that I've seen before include "Sort of sole" , "Kent ferry port" , "White cliffs port" , "Channel port" , "fish" .)