What I want delivered here: good behaviour by pupils (5,4)
I believe the answer is:
order form
'what i want delivered here' is the definition.
(where someone lists items they want)
'good behaviour by pupils' is the wordplay.
'good behaviour' becomes 'order' (good or legal behaviour).
'by' means one lot of letters go next to another.
'pupils' becomes 'form' (class of school pupils).
'order'+'form'='ORDER-FORM'
(Other definitions for order form that I've seen before include "teacher as disciplinarian to do this?" , "It may be necessary for supply" .)