Humour of woman dries up (7)
I believe the answer is:
withers
'dries up' is the definition.
(I've seen this before)
'humour of woman' is the wordplay.
'humour' becomes 'wit' ('wit' can be a synonym of 'humour').
'of woman' becomes 'hers' (I can't justify this - if you can you should give a lot more credence to this answer).
'wit'+'hers'='WITHERS'
Can you help me to learn more?
(Other definitions for withers that I've seen before include "dries up" , "Part between a horse's shoulder blades" , "Shrivels" , "Languishes; part of horse near shoulder-blades" , "Loses freshness or vitality" .)