Minor star explodes to cause bad weather (9)
I believe the answer is:
rainstorm
'bad weather' is the definition.
(I've seen this before)
'minor star explodes' is the wordplay.
'explodes' indicates an anagram.
'minor'+'star'='minorstar'
'minorstar' is an anagram of 'RAINSTORM'.
'to cause' is the link.
(Other definitions for rainstorm that I've seen before include "In bad fall" , "Heavy fall" , "Meteorological phenomenon" , "Heavy downpour" , "ferocious weather" .)