Dark edges of intimate clothing (7)
I believe the answer is:
nightie
'clothing' is the definition.
(nightie is a kind of clothing)
'dark edges of intimate' is the wordplay.
'dark' becomes 'night' (it's dark at nighttime).
'edges of' means to remove the middle letters.
'intimate' with its centre taken out is 'ie'.
'night'+'ie'='NIGHTIE'
(Other definitions for nightie that I've seen before include "Bed attire (colloq.)" , "worn by some retired people" , "Familiar bed-wear for woman" , "put on at end of day?" , "Woman's bedwear" .)