Robin's coat maybe desirable with a fringe of gauze (7)
I believe the answer is:
plumage
'robin's coat' is the definition.
'desirable with a fringe of gauze' is the wordplay.
'desirable' becomes 'plum' (I've seen this before).
'with' says to put letters next to each other.
'fringe of' suggests removing the centre (I've seen 'fringes of' mean this).
'gauze' with its middle taken out is 'ge'.
'plum'+'a'+'ge'='PLUMAGE'
'maybe' is the link.
(Other definitions for plumage that I've seen before include "Bird's covering of feathers" , "Birds' clothing" , "A bird's feathers, may be fancy" , "Cover for diver" , "coat" .)