Andronicus gives you and me the bird! (5)
I believe the answer is:
titus
But I can't explain it at all! Could you help me understand?
(Other definitions for titus that I've seen before include "good book" , "Groan, say" , "Roman emperor, son of Vespasian" , "recipient of holy letter" , "-- Groan, novel by Mervyn Peake" .)