Storm arising from key politician interrupting trial (7)
I believe the answer is:
tempest
'storm' is the definition.
(I know that tempest is a type of windstorm)
'key politician interrupting trial' is the wordplay.
'key' becomes 'e' (musical key).
'politician' becomes 'MP' (Member of Parliament).
'interrupting' indicates putting letters inside.
'trial' becomes 'test' (synonyms).
'e'+'mp'='emp'
'emp' put into 'test' is 'TEMPEST'.
'arising from' is the link.
(Other definitions for tempest that I've seen before include "Outburst" , "Shakesperian storm" , "Shakespeare play with storm scene" , "Violent wind storm" , "commotion" .)