Pieces band arranged back-to-front (5)
I believe the answer is:
parts
'pieces band' is the definition.
'parts' can be an answer for 'pieces'. I am not certain of the 'band' bit.
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for parts that I've seen before include "Leaves" , "bits" , "Strap (anag.)" , "Components of strap" , "Areas" .)