Quirky, eccentric (7)
I believe the answer is:
offbeat
This clue is a double definition.
'quirky' is the first definition.
(I know that quirky can be written as offbeat)
'eccentric' is the second definition.
(I've seen this before)
(Other definitions for offbeat that I've seen before include "Unusual or unconventional - perhaps in music" , "rather unorthodox" , "Strikingly unconventional" , "Odd, unconventional" , "Bohemian" .)