Rip stamen off plant (9)
I believe the answer is:
spearmint
'plant' is the definition.
(spearmint is a kind of plant)
'rip stamen off' is the wordplay.
'off' indicates an anagram.
'rip'+'stamen'='ripstamen'
'ripstamen' is an anagram of 'SPEARMINT'.
(Other definitions for spearmint that I've seen before include "Strongly flavoured herb" , "Herb used for flavouring" , "Aromatic herb" , "Aromatic plant" , "Garden flavouring" .)