Inaction about a plant (9)
I believe the answer is:
nicotiana
'plant' is the definition.
The answer is an example.
'inaction about a' is the wordplay.
'about' is an anagram indicator.
'inaction' anagrammed gives 'nicotian'.
'nicotian'+'a'='NICOTIANA'
(Other definitions for nicotiana that I've seen before include "solanaceous plant" , "source of tobacco" , "Tobacco plant" , "Flower" .)