Awfully proud about grant, leading to heavy fall (8)
I believe the answer is:
downpour
'heavy fall' is the definition.
(I've seen this before)
'awfully proud about grant leading' is the wordplay.
'awfully' indicates an anagram.
'about' means one lot of letters goes inside another.
'grant leading' becomes 'own' (I am not sure about this - if you are sure you should believe this answer much more).
'proud' with letters rearranged gives 'dpour'.
'dpour' enclosing 'own' is 'DOWNPOUR'.
'to' acts as a link.
Can you help me to learn more?
(Other definitions for downpour that I've seen before include "Heavy fall of rain" , "falling water" , "Deluge" , "Now proud (anag)" , "Torrent" .)