Blame wet weather for idiot (9)
I believe the answer is:
lamebrain
'for idiot' is the definition.
(I've seen this before)
'blame wet weather' is the wordplay.
I cannot really see how this works, but
an anagram of 'blame' is 'lameb' which is located in the answer.
'wet' could be 'rain' (wet weather) and 'rain' is located in the answer.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for lamebrain that I've seen before include "two [TOMFOOL] ..." , "Idiot" , "turkey" , "fool" , "So-called dope" .)