The margins a business head demands? (7)
I believe the answer is:
borders
'the margins' is the definition.
(border is a kind of margin)
'a business head demands?' is the wordplay.
'a business head' becomes 'b' (I can't justify this - if you can you should give a lot more credence to this answer).
'demands?' becomes 'orders' (I've seen this before).
'b'+'orders'='BORDERS'
Can you help me to learn more?
(Other definitions for borders that I've seen before include "Boundary lines" , "Perimeters" , "Decorative edges" .)