Gather the woman's hellish (6)
I believe the answer is:
nether
'hellish' is the definition.
Both the definition and answer are adjectives. Perhaps there's an association between them I don't understand?
'gather the woman's' is the wordplay.
'gather' becomes 'net' (I can't justify this - if you can you should give a lot more credence to this answer).
'the woman' becomes 'her' (her refers to a woman).
'net'+'her'='NETHER'
Can you help me to learn more?
(Other definitions for nether that I've seen before include "These regions are beneath" , "Lower, like regions or garments" , "Subordinate" , "Lower; Dutch '-lands'" , "These regions are hell, the underworld" .)