Crossword Genius

I'm great, playing old American music (7)

Ross

I believe the answer is:

ragtime

'old american music' is the definition.

'i'm great playing' is the wordplay.
'playing' is an anagram indicator.
'im'+'great'='imgreat'
'imgreat' is an anagram of 'RAGTIME'.

(Other definitions for ragtime that I've seen before include "Kind of music" , "Form of jazz with a two-four rhythm" , "Migrate to find jazz music" , "Type of music" , "Song and dance" .)

I've seen this clue in The Telegraph.
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