Tunes, about five, by Kentucky composer (10)
I believe the answer is:
stravinsky
'composer' is the definition.
(Stravinsky is an example)
'tunes about five by kentucky' is the wordplay.
'tunes' becomes 'strains' ('strain' can be a synonym of 'tune'**).
'about' is an insertion indicator.
'five' becomes 'v' (roman numeral).
'by' says to put letters next to each other.
'kentucky' becomes 'ky'.
'strains' placed around 'v' is 'stravins'.
'stravins'+'ky'='STRAVINSKY'
(Other definitions for stravinsky that I've seen before include "Igor __, "Firebird" composer" , "he noted" , "Scorer" , "musician?" , "Russian composer" .)