Makes available broadcast of icy conditions (5,2)
I believe the answer is:
frees up
'makes' is the definition.
I don't know anything about this answer so I cannot tell whether it can be defined by this definition.
'available broadcast of icy conditions' is the wordplay.
'available' becomes 'free ' (similar in meaning).
'broadcast of icy conditions' becomes 'sup' (I am not sure about this - if you are sure you should believe this answer much more).
'free'+'sup'='FREES UP'
Can you help me to learn more?
(Other definitions for frees up that I've seen before include "Releases from commitment" , "Restores availability" .)