English politician in trial creating storm (7)
I believe the answer is:
tempest
'storm' is the definition.
(tempest is a kind of storm)
'english politician in trial' is the wordplay.
'english' becomes 'e' (abbreviation).
'politician' becomes 'mp'.
'in' is an insertion indicator.
'trial' becomes 'test' ('test' can be a synonym of 'trial').
'e'+'mp'='emp'
'emp' inserted within 'test' is 'TEMPEST'.
'creating' acts as a link.
(Other definitions for tempest that I've seen before include "Pets met in violent storm" , "Big blow" , "Wild storm" , "violent agitation" , "Violent wind storm" .)