European politician involved in trial in storm (7)
I believe the answer is:
tempest
'storm' is the definition.
(I know that tempest is a type of windstorm)
'european politician involved in trial' is the wordplay.
'european' becomes 'E' (abbreviation e.g. EU).
'politician' becomes 'MP' (Member of Parliament).
'involved in' is an insertion indicator.
'trial' becomes 'test' (synonyms).
'e'+'mp'='emp'
'emp' placed within 'test' is 'TEMPEST'.
'in' is the link.
(Other definitions for tempest that I've seen before include "Test MEP (anag.)" , "terrible blow" , "Shakespeare play with storm scene" , "Play (with rough weather)" , "Violent Shakespearian storm" .)