Hate bit of drab horticulture (5)
I believe the answer is:
abhor
'hate' is the definition.
(abhorring is a kind of hating)
'bit of drab horticulture' is the wordplay.
'bit of' indicates the answer is hidden within the clue.
'ABHOR' is hidden within 'drab horticulture'.
(Other definitions for abhor that I've seen before include "can't stand" , "Reject" , "cannot stand" , "Loathe, find repugnant" , "Execrate" .)