Vocally expresses disapproval of sailors' drunken voyage (5,6)
I believe the answer is:
booze cruise
'drunken voyage' is the definition.
(cruise with lots of alcohol)
'vocally expresses disapproval of sailors'' is the wordplay.
'vocally' shows a homophone (sound like).
'expresses disapproval' becomes 'boos' (to boo someone is to express disapproval with them).
'of sailors'' becomes 'cruise' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'boos' is a homophone of 'booze'.
'booze'+'cruise'='BOOZE CRUISE'
(Other definitions for booze cruise that I've seen before include "travel to avoid duty" , "cross channel shopping trip?" .)