Not the cry of an expensive bird? (5)
I believe the answer is:
cheep
'cry of an expensive bird?' is the definition.
'cheep' can be an answer for 'cry' (cheep is a kind of cry). I'm not certain of the 'of an expensive bird?' bit.
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for cheep that I've seen before include "Make contribution to Twitter" , "Sing like a bird" , "Cry of new-born chick" , "Chirrup" , "tweet" .)