Some musicians met an ancient composer (7)
I believe the answer is:
smetana
'composer' is the definition.
(I know that Smetana is a composer)
'some musicians met an ancient' is the wordplay.
'some' says the answer is hidden in the clue (some parts of the word are used).
'SMETANA' is hidden in the letters of 'musicians met an ancient'.
(Other definitions for smetana that I've seen before include "maker of notes" , "Czech composer, d. 1884 - Eastman (anag)" , "musician" , "Nineteenth century Czech composer (The Bartered Bride)" , "Bedrich ____, composer of "The Bartered Bride" and "The Kiss"" .)