Save a sailor on holiday (4,4)
I believe the answer is:
salt away
'save' is the definition.
(thesaurus)
'a sailor on holiday' is the wordplay.
'a sailor' becomes 'salt' (salt is a kind of sailor).
'on holiday' becomes 'away' (I've seen this before).
'salt'+'away'='SALT AWAY'
(Other definitions for salt away that I've seen before include "Store" , "Save" , "principle of low-sodium diet?" , "Stash" , "bank" .)