The range of some folksier rapper (6)
I believe the answer is:
Here is my best explanation:
'the range of' is the definition.
(I've seen this before)
'some folksier rapper' is the wordplay.
'some' indicates the answer is hidden within the clue (some of the parts of the word are used).
'SIERRA' is hidden within 'folksier rapper'.
(Other definitions for sierra that I've seen before include "Long range", "Mountain range -- code word for S", "A range of mountains in Spain", "Jagged mountain chain", "Comms code S", "Mountain range in Spanish-speaking countries", "Jagged mountains - code word for S", "Vehicle", "Range of mountains with jagged peaks" and "S; mountain chain".)