Name this person turning up to provide a sort of medicine (6)
I believe the answer is:
emetic
'a sort of medicine' is the definition.
'name this person turning up' is the wordplay.
'name' becomes 'cite' (I've seen this in other clues**).
'this person' becomes 'me' (I've seen this in other clues).
'turning up' says the letters should be written in reverse.
'cite'+'me'='citeme'
'citeme' written backwards gives 'EMETIC'.
'to provide' is the link.
(Other definitions for emetic that I've seen before include "Medicine to make you sick" , "Purgative" , "making you throw up" , "It sickens one" , "Ipecac is one" .)