Get free headgear in English Home Counties (6)
I believe the answer is:
escape
'get free' is the definition.
'headgear in english home counties' is the wordplay.
'headgear' becomes 'cap' (cap is a kind of headgear).
'in' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'home counties' becomes 'se'.
'e'+'se'='ese'
'cap' going inside 'ese' is 'ESCAPE'.
(Other definitions for escape that I've seen before include "Way out (from difficult situation)" , "Get away from confinement" , "Duck" , "has to fly" , "Key < flight" .)