English politician in tax storm (7)
I believe the answer is:
tempest
'storm' is the definition.
(I know that storm can be written as tempest)
'english politician in tax' is the wordplay.
'english' becomes 'e' (abbreviation).
'politician' becomes 'MP' (Member of Parliament).
'in' is an insertion indicator.
'tax' becomes 'test' (taxing can mean testing or demanding).
'e'+'mp'='emp'
'emp' placed inside 'test' is 'TEMPEST'.
(Other definitions for tempest that I've seen before include "Wild storm" , "Shakesperian storm" , "Play (with rough weather)" , "terrible blow" , "violent agitation" .)