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' can be found hidden inside 'simple harmony'.
'providing' acts as a 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" .)