Beat, not beet? (4)
I believe the answer is:
cane
I believe this clue is a double definition.
'beat' is the first definition.
(I know that cane is a kind of beat)
'not beet?' is the second definition.
(I've seen this before)
(Other definitions for cane that I've seen before include "not beet" , "Beat - bamboo - stick" , "Old school punishment" , "Bamboo rod" , "Sugar plant" .)