Drier (5)
(Other definitions for towel that I've seen before include "Bathroom cloth" , "Piece of absorbent cloth or paper for drying" , "Dryer" , "Owlet (anag)" , "what sweater needs?" .)
'drier' is the definition.
(frame for airing wet clothes)
This is all the clue.
(Other definitions for airer that I've seen before include "Support for drying" , "What launderers may use" , "Clothes-horse" , "Dryer" , "Clothes horse" .)