Candidate is poisonous creature, I storm angrily (8)
I believe the answer is:
aspirant
'candidate' is the definition.
(I've seen this in another clue)
'poisonous creature i storm angrily' is the wordplay.
I cannot really understand how this works, but
'creature' could be 'ant' (ant is a kind of animal) and 'ant' is found within the answer.
'i' could be 'a' and 'a' is present in the answer.
This explanation may well be incorrect...
'is' acts as a link.
Can you help me to learn more?
(Other definitions for aspirant that I've seen before include "His desire could make him" , "One hoping for success" , "Seeker after success" , "pretender" , "Candidate; one with a desire to succeed" .)