I pressure a revolutionary to seize English crown (6)
I believe the answer is:
apogee
'crown' is the definition.
(I've seen this before)
'i pressure a revolutionary to seize english' is the wordplay.
'i' becomes 'ego' ('I' in Latin).
'pressure' becomes 'p' (abbreviation).
'revolutionary' says the letters should be written in reverse (letters revolve around).
'to seize' means one lot of letters goes inside another.
'english' becomes 'E' (abbreviation).
'ego'+'p'+'a'='egopa'
'egopa' in reverse letter order is 'apoge'.
'apoge' placed around 'e' is 'APOGEE'.
(Other definitions for apogee that I've seen before include "highest height" , "Final climactic stage" , "crown" , "Orbit's furthest point" , "Satellite's furthest point" .)