Broke a leg in a storm (4)
I believe the answer is:
gale
'storm' is the definition.
(a gale is a windy storm)
'broke a leg' is the wordplay.
'broke' is an anagram indicator.
'a'+'leg'='aleg'
'aleg' with letters rearranged gives 'GALE'.
'in a' acts as a link.
(Other definitions for gale that I've seen before include "Bille from a bladder" , "Fierce wind" , "A wild storm" , "A storm of wind and rain" , "Force 8 wind" .)