Rondo is composed at home (7)
I believe the answer is:
indoors
'home' is the definition.
(I've seen this before)
'rondo is composed' is the wordplay.
'composed' indicates anagramming the letters.
'rondo'+'is'='rondois'
'rondois' with letters rearranged gives 'INDOORS'.
'at' acts as a link.
(Other definitions for indoors that I've seen before include "Having returned to pavilion" , "Within house" , "Within the four walls" , "Within a building" , "Covered" .)