Hanging back as arranged, partly (5)
I believe the answer is:
arras
'hanging' is the definition.
(arras is a kind of hanging)
'back as arranged partly' is the wordplay.
'back' says the letters should be written in reverse.
'partly' indicates the answer is hidden within the clue.
'sarra' is hidden within 'as arranged'.
'sarra' back-to-front is 'ARRAS'.
(Other definitions for arras that I've seen before include "Tapestry; WW One battle" , "Tapestry wall hanging" , "Polonius met his end behind one" , "Tapestry; French town" , "Wall hanging of heavy woven fabric" .)