Dream girl heads section (8)
I believe the answer is:
Here is my best explanation:
'section' is the definition.
('division' can be a synonym of 'section')
'dream girl heads' is the subsidiary indication.
'dream' becomes 'vision' (I've seen this before).
'girl' becomes 'di'.
'heads' means one lot of letters go next to another (some letters go ahead of others).
'vision' put after 'di' is 'division'.
(Other definitions for division that I've seen before include "Major unit of an organisation or maths function", "Parliamentary vote", "Army unit", "Mathematical act for a body of troops.", "A number of teams grouped together in sport according to ability", "Group of football teams", "Discord, split", "It can be long or short, in arithmetic", "Large army unit" and "Taking of a vote; partition".)