Proud now — unexpectedly getting a fall? (8)
I believe the answer is:
downpour
'a fall?' is the definition.
(thesaurus)
'proud now unexpectedly' is the wordplay.
'unexpectedly' indicates anagramming the letters.
'proud'+'now'='proudnow'
'proudnow' anagrammed gives 'DOWNPOUR'.
'getting' is the link.
(Other definitions for downpour that I've seen before include "Now proud (anag)" , "Heavy shower" , "Deluge" , "Heavy fall of rain" , "Cloudburst" .)