Engineer sends man away for resources (4,3,5)
I believe the answer is:
ways and means
'resources' is the definition.
(thesaurus)
'engineer sends man away' is the wordplay.
'engineer' is an anagram indicator.
'sends'+'man'+'away'='sendsmanaway'
'sendsmanaway' is an anagram of 'WAYS AND MEANS'.
'for' is the link.
(Other definitions for ways and means that I've seen before include "Resources - House of Commons committee" , "Resources for achieving something" .)