Rough, bumpy (6)
I believe the answer is:
uneven
I believe this clue is a double definition.
'rough' is the first definition.
(associated in meaning)
'bumpy' is the second definition.
(I've seen this in another clue)
(Other definitions for uneven that I've seen before include "Rough, bumpy" , "Rough, jagged" , "Rugged" , "Inconsistent in quality or shape" , "Asymmetrical, not uniform" .)