Perform twice with departed bird (4)
I believe the answer is:
dodo
'departed bird' is the definition.
'dodo' can be an answer for 'bird' (dodo is a kind of bird). I'm unsure of the 'departed' bit.
'perform twice' is the wordplay.
'perform' becomes 'do' (both can mean complete an action).
'twice' shows that letters should be duplicated.
'do' duplicated is 'DODO'.
'with' is the link.
Can you help me to learn more?
(Other definitions for dodo that I've seen before include "Extinct bird of Mauritius, very dead" , "one finished?" , "One deeply reactionary" , "Square" , "Old fogey" .)