It's manoeuvred best in a French port (7)
I believe the answer is:
antibes
'french port' is the definition.
(I've seen this before)
'it's manoeuvred best in a' is the wordplay.
'it's manoeuvred' is an anagram indicator.
'best'+'in'+'a'='bestina'
'bestina' is an anagram of 'ANTIBES'.
(Other definitions for antibes that I've seen before include "French Riviera resort" , "French Mediterranean resort" , "French port" , "French community" .)