Have a position about measure in county council leave (7)
I believe the answer is:
licence
'county council leave' is the definition.
'licence' can be an answer for 'leave' (I've seen this before). I am not certain of the 'county council' bit.
'have a position about measure in' is the wordplay.
'have a position' becomes 'lice' (I can't explain this - if you can you should give a lot more credence to this answer).
'about' becomes 'c' (abbreviation for 'circa').
'measure' becomes 'en' (typographical measure).
'in' indicates putting letters inside.
'c'+'en'='cen'
'lice' placed around 'cen' is 'LICENCE'.
Can you help me to learn more?
(Other definitions for licence that I've seen before include "Authority - or freedom!" , "the green light" , "Driving permit" , "Permit - freedom" , "Official permit" .)