It's harsh when cool clubs allow people inside (9)
I believe the answer is:
inclement
'it's harsh' is the definition.
(both can describe bad weather)
'cool clubs allow people inside' is the wordplay.
'cool clubs' becomes 'inc' (I can't justify this - if you can you should believe this answer much more).
'allow' becomes 'let' (synonyms).
'people' becomes 'men' (men are people).
'inside' means one lot of letters goes inside another.
'let' going around 'men' is 'lement'.
'inc'+'lement'='INCLEMENT'
'when' is the link.
Can you help me to learn more?
(Other definitions for inclement that I've seen before include "severe" , "Weather so awful" , "not fair" , "Stormy" , "Such harsh weather" .)