Chants may confuse sailor (9)
I believe the answer is:
'sailor' is the definition.
(I know that sailor can be written as yachtsman)
'chants may confuse' is the wordplay.
'confuse' indicates an anagram.
'chantsmay' is an anagram of 'YACHTSMAN'.
(Other definitions for yachtsman that I've seen before include "Description of Chichester" , "Pleasure sailor" , "crafty person" , "Ainslie, for example" , "sportsperson involved with rigging?" .)