Complicated genetic line includes line producing cleverness (12)
I believe the answer is:
intelligence
'cleverness' is the definition.
(thesaurus)
'complicated genetic line includes line' is the wordplay.
'complicated' is an anagram indicator.
'includes' indicates putting letters inside.
'line' becomes 'l'.
'genetic'+'line'='geneticline'
'geneticline' is an anagram of 'inteligence'.
'inteligence' enclosing 'l' is 'INTELLIGENCE'.
'producing' acts as a link.
(Other definitions for intelligence that I've seen before include "Covertly gathered information" , "Mental brightness" , "Covert information" , "Spy reports" , "Covertly-gathered info" .)