Person belonging to underworld apparently cut to pieces (9)
I believe the answer is:
dismember
'cut to pieces' is the definition.
(synonyms)
'person belonging to underworld' is the wordplay.
'person belonging' becomes 'member' (I can't justify this - if you can you should believe this answer much more).
'to' is a charade indicator (letters next to each other) (I've seen this in other clues).
'underworld' becomes 'dis' (underworld in classical mythology).
'member' put after 'dis' is 'DISMEMBER'.
'apparently' is the link.
Can you help me to learn more?
(Other definitions for dismember that I've seen before include "Divide up (organisation)" , "Remove the limbs of, or divide into parts" , "Dissect" , "Break up" , "Tear limb from limb" .)