Sheer fabric (7)
'sheer fabric' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for chiffon that I've seen before include "Fine transparent fabric" , "Thin light fabric" , "Fine material" , "Sheer silk or rayon fabric" , "Light silk/nylon fabric" .)
(Other definitions for gauze that I've seen before include "Very fine wire mesh" , "Medical cloth" , "Thin transparent material" , "first-aid material" , "Thin bleached cotton cloth used for dressings etc" .)