Brownish-grey (3)
I believe this clue is a double definition.
'brownish' is the first definition.
(thesaurus)
'grey' is the second definition.
(I know that taupe is a type of grey)
(Other definitions for taupe that I've seen before include "Fifty Shades of Grey must include this" , "shade" , "Grey-brown colour" , "Grey tinged with brown" , "Greyish brown" .)
I believe this is a double definition.
'brownish' is the first definition.
(dun means of a brownish colour)
'grey' is the second definition.
(thesaurus)
(Other definitions for dun that I've seen before include "Pursue or badger for debt" , "Dull brownish-grey colour" , "... to demand payment" , "press for money" , "nag, for payment" .)