Angelica's flogged as a painkiller (9)
I believe the answer is:
analgesic
'a painkiller' is the definition.
(synonyms)
'angelica's flogged' is the wordplay.
'flogged' indicates an anagram.
'angelicas' with letters rearranged gives 'ANALGESIC'.
'as' acts as a link.
(Other definitions for analgesic that I've seen before include "Pain-releaving drug" , "A medicine used to relieve pain" , "Anodyne" , "Acting to relieve pain" , "result is soothing" .)