It's ice on the peak, you fool! (9)
I believe the answer is:
blockhead
'fool' is the definition.
(I've seen this in another clue)
'it's ice on the peak' is the wordplay.
'it's ice on' becomes 'block' (I can't explain this - if you can you should believe this answer much more).
'the peak' becomes 'head' (head is a kind of peak).
'block'+'head'='BLOCKHEAD'
'you' acts as a link.
Can you help me to learn more?
(Other definitions for blockhead that I've seen before include "Stupid person" , "Dolt" .)