Composer famous for his waltzes (7)
I believe the answer is:
strauss
'composer famous for his waltzes' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for strauss that I've seen before include "Composer of Blue Danube waltz" , "34 [CRICKETER]" , "Viennese composer" , "scorer" , "Austrian composer of waltzes" .)