Handy arrangement for a composer (5)
I believe the answer is:
haydn
'for a composer' is the definition.
(Haydn is an example)
'handy arrangement' is the wordplay.
'arrangement' indicates anagramming the letters.
'handy' is an anagram of 'HAYDN'.
(Other definitions for haydn that I've seen before include "Barman" , "Creation composer" , "Austrian musician" , "Josef --, prolific composer" , "Classical composer" .)