Embrocation finally rubbed into chest — awful stink (6)
I believe the answer is:
stench
'stink' is the definition.
('stench' can be a synonym of 'stink')
'embrocation finally rubbed into chest awful' is the wordplay.
'finally' indicates one should take the final letters.
'rubbed into' indicates putting letters inside.
'awful' indicates an anagram.
The last letter of 'embrocation' is 'n'.
'chest' with letters rearranged gives 'stech'.
'n' going inside 'stech' is 'STENCH'.
(Other definitions for stench that I've seen before include "Dreadful pong" , "A really foul smell" , "Terrible smell" , "Reek" , "Stink" .)