Composer providing some simple harmony (5)
I believe the answer is:
lehar
'composer' is the definition.
(Austro-Hungarian composer Franz Lehar)
'some simple harmony' is the wordplay.
'some' indicates a hidden word (some parts of the word are used).
'LEHAR' is hidden in the letters of 'simple harmony'.
'providing' is the link.
(Other definitions for lehar that I've seen before include "Austrian of note" , "Franz . . . . . composed 'The Merry Widow'" , "Musician" , "Hungarian composer of operettas" , "Viennese composer" .)