Discharge from English mother country (9)
I believe the answer is:
emanation
'discharge' is the definition.
(thesaurus)
'english mother country' is the wordplay.
'english' becomes 'e' (abbreviation).
'mother' becomes 'ma' (ma is a kind of mother).
'country' becomes 'nation' ('nation' can be a synonym of 'country').
'e'+'ma'+'nation'='EMANATION'
'from' is the link.
(Other definitions for emanation that I've seen before include "Something issuing from a source" , "discharge" , "Something flowing out from a source" , "Issue" , "produce radioactive gas" .)