Model Charley and Pat constructed (10)
I believe the answer is:
archetypal
'model' is the definition.
(thesaurus)
'charley and pat constructed' is the wordplay.
'and' means one lot of letters go next to another (I've seen this in other clues).
'constructed' is an anagram indicator.
'charley' put after 'pat' is 'patcharley'.
'patcharley' is an anagram of 'ARCHETYPAL'.
(Other definitions for archetypal that I've seen before include "Classic N chapel tray (anag)" , "Quintessential" , "Model" .)