Forcible opening around English border (8)
I believe the answer is:
vehement
'forcible' is the definition.
(I've seen this before)
'opening around english border' is the wordplay.
'opening' becomes 'vent' (vent is a kind of opening**).
'around' is an insertion indicator.
'english' becomes 'e' (abbreviation).
'border' becomes 'hem' (I've seen this before).
'e'+'hem'='ehem'
'vent' enclosing 'ehem' is 'VEHEMENT'.
(Other definitions for vehement that I've seen before include "Forceful and with full conviction" , "Irish symbol" , "Furious" , "Forceful, ardent" , "Forceful, emphatic" .)