A leg's broken by hard blows (5)
I believe the answer is:
gales
'hard blows' is the definition.
The definition and answer can be both types of natural phenomena as well as being plural nouns.
Perhaps there's an association between them I don't understand?
'a leg's broken' is the wordplay.
'broken' indicates anagramming the letters.
'a'+'legs'='alegs'
'alegs' is an anagram of 'GALES'.
'by' acts as a link.
Can you help me to learn more?
(Other definitions for gales that I've seen before include "Strong winds" , "Weather conditions" , "Force 7 to 10 winds" , "They're force 7 to 10 on the Beaufort scale" , "High winds" .)