Plant scholar (8)
I believe the answer is:
botanist
'plant scholar' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for botanist that I've seen before include "investigating bloomers, for example?" , "Student of plants" , "To sit ban out for expert in study of plants" , "Expert in study of plants and trees" , "One studying plants" .)