A nice long break may be pleasing (9)
I believe the answer is:
congenial
'be pleasing' is the definition.
(thesaurus)
'a nice long break' is the wordplay.
'break' indicates an anagram.
'a'+'nice'+'long'='anicelong'
'anicelong' with letters rearranged gives 'CONGENIAL'.
'may' acts as a link.
(Other definitions for congenial that I've seen before include "Suited to one's taste" , "relaxing" , "Having similar interests" , "Pleasant and agreeable" , "Harmonious and friendly" .)