Holst's "The Planets," for one (5)
I believe the answer is:
suite
'holst's the planets for one' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for suite that I've seen before include "Retinue; apartment" , "Adjoining rooms" , "Train of followers" , "Extensive accommodation" , "Set of rooms; retinue" .)