Plant suffering all round border (8)
I believe the answer is:
agrimony
'plant' is the definition.
(agrimony is a kind of plant)
'suffering all round border' is the wordplay.
'suffering' becomes 'agony' ('agony' can be a synonym of 'suffering').
'all round' means one lot of letters goes inside another.
'border' becomes 'rim' (I've seen this before).
'agony' enclosing 'rim' is 'AGRIMONY'.
(Other definitions for agrimony that I've seen before include "Growth" , "Plant with yellow flower-spikes" .)