Revised many new ads as resources (4,3,5)
I believe the answer is:
ways and means
'resources' is the definition.
(thesaurus)
'revised many new ads as' is the wordplay.
'revised' indicates an anagram.
'many'+'new'+'ads'+'as'='manynewadsas'
'manynewadsas' anagrammed gives 'WAYS AND MEANS'.
(Other definitions for ways and means that I've seen before include "Resources for achieving something" , "Resources - House of Commons committee" .)