Forceful English politician in charge should admit pork pie maybe (8)
I believe the answer is:
emphatic
'forceful' is the definition.
('emphatic' can be similar in meaning to 'forceful')
'english politician in charge should admit pork pie maybe' is the wordplay.
'english' becomes 'e' (abbreviation).
'politician' becomes 'mp'.
'in charge' becomes 'ic'.
'should admit' is an insertion indicator.
'pork pie maybe' becomes 'hat'.
'mp'+'ic'='mpic'
'mpic' placed around 'hat' is 'mphatic'.
'e'+'mphatic'='EMPHATIC'
(Other definitions for emphatic that I've seen before include "speaking firmly" , "Able to experience another's feelings" , "For sure" , "Forceful in expression" , "Forceful and definite" .)