A member after volume, one about horror story creature (7)
I believe the answer is:
vampire
'horror story creature' is the definition.
(supernatural creature)
'a member after volume one' is the wordplay.
'member' becomes 'MP' (Member of Parliament).
'after' says to put letters next to each other.
'volume' becomes 'v' (abbreviation for volume in book titles).
'one' becomes 'ire' (I am not sure about this - if you are sure you should believe this answer much more).
'a'+'mp'='amp'
'amp' after 'v' is 'vamp'.
'vamp'+'ire'='VAMPIRE'
'about' is the link.
Can you help me to learn more?
(Other definitions for vampire that I've seen before include "Blood sucker" , "Body that rises at night to drink the blood of the living" , "Type of bat" , "fabulous creature" , "Bloodsucking creature" .)