Not even turbulent (5)
I believe the answer is:
rough
I believe this clue is a double definition.
'not even' is the first definition.
'turbulent' is the second definition.
(synonyms)
(Other definitions for rough that I've seen before include "Jagged" , "Rasping" , "that driver tries to avoid" , "Uneven - approximate - stormy" , "Rowdy - part of golf course" .)