First-rate arrangement for a performer (7)
I believe the answer is:
artiste
'for a performer' is the definition.
(an artiste is a performer or entertainer)
'first-rate arrangement' is the wordplay.
I cannot really see how this works, but
'first' could be 'ist' (ist resembles 1st) and 'ist' is present in the answer.
an anagram of 'rate' is 'arte' which is within the left over letters.
This accounts for all the letters.
This explanation may well be incorrect...
Can you help me to learn more?
(Other definitions for artiste that I've seen before include "Performers" , "Tears it (anag.)" , "Player" , "Person playing" , "A sitter for creative person" .)