Doesn't upset the port (6)

I believe the answer is:

ostend

'the port' is the definition.
(I've seen this before)

'doesn't upset' is the wordplay.
'upset' indicates an anagram.
'doesnt' with letters rearranged gives 'OSTEND'.

(Other definitions for ostend that I've seen before include "somewhere in Europe" , "Belgian port and resort" , "Port in Belgium" , "Port -- stoned (anag)" , "European port" .)

I've seen this clue in the Evening Standard.

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