County stores let rector inside (10)
I believe the answer is:
shropshire
'county' is the definition.
(I've seen this before)
'stores let rector inside' is the wordplay.
'stores' becomes 'shops' (store can mean a shop).
'let' becomes 'hire' (I've seen this in another clue).
'rector' becomes 'r'.
'inside' means one lot of letters goes inside another.
'shops'+'hire'='shopshire'
'shopshire' going around 'r' is 'SHROPSHIRE'.
(Other definitions for shropshire that I've seen before include "county" , "largely rural location" , "Region of England" .)