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

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

TET (a military offensive during the Vietnam War), then SUN (tabloid newspaper that was widely boycotted in Liverpool after it falsely blamed Liverpool fans involved in the Hillsborough stadium disaster) reversed (sent back) after A . Complaint = a medical problem, in this case a bacterial infection causing muscle spasms.