Say, Bill designed courses (7)
I believe the answer is:
syllabi
'courses' is the definition.
(I've seen this before)
'say bill designed' is the wordplay.
'designed' indicates anagramming the letters (designed with the letters).
'say'+'bill'='saybill'
'saybill' with letters rearranged gives 'SYLLABI'.
(Other definitions for syllabi that I've seen before include "exam documentation" , "Programmes of study courses" , "Course outlines" , "Programmes of studies" , "Details of courses" .)