Piano composer not the first or last in a native group (4)
I believe the answer is:
hopi
'a native group' is the definition.
(Native American tribe)
'piano composer not the first or last' is the wordplay.
'piano composer' becomes 'chopin' (Frederic Chopin).
'not the first or last' says to take the centre (the first and last letters are removed).
The centre of 'chopin' is 'HOPI'.
'in' is the link.
(Other definitions for hopi that I've seen before include "Pueblo tribe member" , "North American Indian people" , "Native Americans" , "Language" , "Member of a Pueblo Indian people of northeastern Arizona" .)