Storm in Belgium with freakish result (7)
I believe the answer is:
bluster
'storm' is the definition.
(thesaurus)
'belgium with freakish result' is the wordplay.
'belgium' becomes 'b' (international vehicle registration code).
'with' means one lot of letters go next to another.
'freakish' indicates anagramming the letters.
'result' is an anagram of 'luster'.
'b'+'luster'='BLUSTER'
'in' acts as a link.
(Other definitions for bluster that I've seen before include "Show off" , "Speak boastfully" , "Loud aggressive talk" , "Braggadocio" , "Boastful and bullying talk" .)