Unconventional Czech (8)
I believe the answer is:
bohemian
I believe this clue is a double definition.
'unconventional' is the first definition.
(similar in meaning)
'czech' is the second definition.
(I've seen this before)
(Other definitions for bohemian that I've seen before include "Czech" , "Unconventional type" , "Opera by Balfe 'The . . . . . . . . Girl'" , "Unconventional artist" , "Artistic, unconventional" .)