Offensive publication despised in Liverpool sent back after a complaint (7)

I believe the answer is:
tetanus
'a complaint' is the definition.
(tetanus is a kind of health problem)
'offensive publication despised in liverpool sent back' is the wordplay.
'offensive' becomes 'tet' (Tet Offensive, Vietnam War military campaign).
'publication' becomes 'sun' (I have seen 'British publication' mean 'sun' so perhaps 'publication' could also mean 'sun').
'despised in liverpool' becomes 'a' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'sent back' shows that the letters should be reversed in order.
'sun'+'a'='suna'
'suna' back-to-front is 'anus'.
'tet'+'anus'='TETANUS'
'after' acts as a link.
Can you help me to learn more?
(Other definitions for tetanus that I've seen before include "infectious disease" , "Infection from wound" , "health problem" , "Disease causing muscular spasms" , "Attunes (anag) - muscular illness" .)
