Relaxing start of recital with arrangement for flutes (7)
I believe the answer is:
restful
'relaxing' is the definition.
(I know that relaxing can be written as restful)
'start of recital with arrangement for flutes' is the wordplay.
'start of' says to take the initial letters.
'with' says to put letters next to each other.
'arrangement for' indicates an anagram (I've seen this in other clues).
The first letter of 'recital' is 'r'.
'flutes' with letters rearranged gives 'estful'.
'r'+'estful'='RESTFUL'
(Other definitions for restful that I've seen before include "Sedative" , "Tranquil - fluster (anag)" , "Calm" , "Relaxing" , "Soothing is required" .)