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 "between a regiment and a corps?", "Parliamentary vote", "Large army unit", "some police?", "Arithmetic operation", "Formal vote in Parliament", "It can be long or short, in arithmetic", "Discord, split", "Boundary" and "Mathematical act for a body of troops.".)