Torment tiresome sort outside electronic plant (9)
I believe the answer is:
hellebore
'plant' is the definition.
The answer is an example.
'torment tiresome sort outside electronic' is the wordplay.
'torment' becomes 'hell'.
'tiresome sort' becomes 'bore' (a boring person).
'outside' means one lot of letters goes inside another.
'electronic' becomes 'e' (as in e-mail or e-books).
'hell'+'bore'='hellbore'
'hellbore' placed around 'e' is 'HELLEBORE'.
(Other definitions for hellebore that I've seen before include "Flower of the lily family found in rebel hole" , "flowering plant" , "In bed I grow" , "Poisonous plant" , "aconite?" .)