Great hotel breaks, everything included (10)
I believe the answer is:
altogether
'everything included' is the definition.
(synonyms)
'great hotel breaks' is the wordplay.
'breaks' indicates anagramming the letters.
'great'+'hotel'='greathotel'
'greathotel' is an anagram of 'ALTOGETHER'.
(Other definitions for altogether that I've seen before include "Quite" , "Entirely" , "special to get Hermes trousers" , "Wholly" , "nude in this" .)