The club boat's changed course! (5)
I believe the answer is:
baton
'the club' is the definition.
(I've seen this before)
'boat's changed course' is the wordplay.
'changed' indicates anagramming the letters.
'course' becomes 'n'.
'boat' is an anagram of 'bato'.
'bato'+'n'='BATON'
(Other definitions for baton that I've seen before include "weapon" , "Stick passed in relay races" , "Relay race stick" , "A stick for a conductor and policeman" , "Controller of players" .)