Woman’s behind curtain material in the lower area (6)
I believe the answer is:
nether
'lower area' is the definition.
'woman's behind curtain material' is the wordplay.
'woman' becomes 'her' (**).
'behind' means one lot of letters go next to another.
'curtain material' becomes 'net'.
'her' after 'net' is 'NETHER'.
'in the' is the link.
(Other definitions for nether that I've seen before include "Lower; Dutch '-lands'" , "These garments are for the bottom half" , "These regions are hell, the underworld" , "inferior" , "Located below" .)