Plant in grade A ground (8)
I believe the answer is:
gardenia
'plant' is the definition.
The answer is an example.
'in grade a ground' is the wordplay.
'ground' is an anagram indicator (grind the letters ).
'in'+'grade'+'a'='ingradea'
'ingradea' anagrammed gives 'GARDENIA'.
(Other definitions for gardenia that I've seen before include "bloomer!" , "Fragrant shrub, red again (anag.)" , "Shrub with fragrant flowers - in Grade A (anag)" , "Bad drainage can produce a fragrant flower" , "Drainage for shrub with white or yellow flowers" .)