County subdivision (8)
I believe the answer is:
township
'county subdivision' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for township that I've seen before include "In South Africa during apartheid, an urban area assigned to black nationals" , "Urban area for non-whites in South Africa under apartheid" , "Municipality" , "Old manor" , "farm in Scotland (shared with other tenants)" .)