Trial engulfs European politician in storm (7)
I believe the answer is:
tempest
'storm' is the definition.
(I know that storm can be written as tempest)
'trial engulfs european politician' is the wordplay.
'trial' becomes 'test' (synonyms).
'engulfs' means one lot of letters goes inside another.
'european' becomes 'E' (abbreviation e.g. EU).
'politician' becomes 'MP' (Member of Parliament).
'e'+'mp'='emp'
'test' placed around 'emp' is 'TEMPEST'.
'in' acts as a link.
(Other definitions for tempest that I've seen before include "Shakespearean storm?" , "terrible blow" , "tosser!" , "Play (with rough weather)" , "violent agitation" .)