Rag: it's arranged for free (6)
I believe the answer is:
gratis
'free' is the definition.
('gratis' can be a synonym of 'free')
'rag it's arranged' is the wordplay.
'arranged' indicates anagramming the letters.
'rag'+'its'='ragits'
'ragits' is an anagram of 'GRATIS'.
'for' acts as a link.
(Other definitions for gratis that I've seen before include "Free, costs nothing" , "Free, at no cost" , "Without charge" , "Free of charge" , "Without payment" .)