Have recourse to a new roster (6)
I believe the answer is:
resort
'have recourse to' is the definition.
(thesaurus)
'a new roster' is the wordplay.
'a new' indicates an anagram.
'roster' anagrammed gives 'RESORT'.
(Other definitions for resort that I've seen before include "Delightful place to take a break" , "Source of help - holiday location" , "Place to visit" , "Place much frequented" , "Have recourse (to)" .)