Some nice ‘n' interesting old British folk (5)
I believe the answer is:
iceni
'old british folk' is the definition.
(tribe of ancient Britons)
'some nice n interesting' is the wordplay.
'some' says the answer is hidden in the clue (some of the parts of the word are used).
'ICENI' is hidden within 'nice n interesting'.
(Other definitions for iceni that I've seen before include "Old people" , "Boudica's tribe" , "Ancient British tribe" , "Rebellious tribe" , "people rebelling against Rome" .)