Bird initially makes a sound like a crow (5)
I believe the answer is:
macaw
'bird' is the definition.
(macaw is a kind of bird)
'initially makes a sound like a crow' is the wordplay.
'initially' indicates taking the first letters.
'sound like a crow' becomes 'caw'.
The initial letter of 'makes' is 'm'.
'm'+'a'+'caw'='MACAW'
(Other definitions for macaw that I've seen before include "Large colourful parrot" , "Chattering cousin of a cockatoo" , "Type of parrot" , "Avian chatterbox" , "Colourful creature" .)