Forceful English edge into opening (8)
I believe the answer is:
vehement
'forceful' is the definition.
(I've seen this before)
'english edge into opening' is the wordplay.
'english' becomes 'e' (abbreviation).
'edge' becomes 'hem' (I've seen this before).
'into' indicates putting letters inside.
'opening' becomes 'vent' (vent is a kind of opening).
'e'+'hem'='ehem'
'ehem' inserted within 'vent' is 'VEHEMENT'.
(Other definitions for vehement that I've seen before include "Of speech, intense and forceful" , "Burning" , "Forcefully emphatic" , "Energetic" , "Vigorous, emphatic" .)