Prudent, comic alone in resort (10)
I believe the answer is:
economical
'prudent' is the definition.
(thesaurus)
'comic alone in resort' is the wordplay.
'in resort' indicates anagramming the letters.
'comic'+'alone'='comicalone'
'comicalone' is an anagram of 'ECONOMICAL'.
(Other definitions for economical that I've seen before include "Frugal" , "Inexpensive" , "Thrifty" , "Cheap" , "Providing good value" .)