Great at manoeuvring in series of yacht races? (7)
I believe the answer is:
regatta
'series of yacht races?' is the definition.
(I've seen this before)
'great at manoeuvring' is the wordplay.
'manoeuvring' indicates anagramming the letters.
'great'+'at'='greatat'
'greatat' is an anagram of 'REGATTA'.
'in' is the link.
(Other definitions for regatta that I've seen before include "Display of boats" , "Racing boats" , "Boat race-meeting" , "E.g. Henley" , "Boating event" .)