A lot of wind leads to oppressive rain and bad conditions (7)
I believe the answer is:
squalor
'conditions' is the definition.
(I have seen 'Filthy conditions ' mean 'squalor' so perhaps 'conditions' could also mean 'squalor')
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for squalor that I've seen before include "State of misery and filth" , "Dirty and unpleasant state (in which to live)" , "sleaze" , "Disgusting filth" , "Verdi's Egyptian opera" .)