Fool to blame terrible weather (9)
I believe the answer is:
lamebrain
'fool' is the definition.
(I've seen this before)
'blame terrible weather' is the wordplay.
'terrible' indicates anagramming the letters.
'weather' becomes 'rain' (rain is a kind of weather).
'blame' is an anagram of 'lameb'.
'lameb'+'rain'='LAMEBRAIN'
'to' acts as a link.
(Other definitions for lamebrain that I've seen before include "turkey" , "Idiot" , "two [TOMFOOL] ..." , "Nelly" , "So-called dope" .)