Birds sound like doves with empty tummies (5)
I believe the answer is:
'birds' is the definition.
(coot is a kind of bird)
'sound like doves with empty tummies' is the wordplay.
'sound like doves' becomes 'coo' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'with' says to put letters next to each other.
'empty' says to hollow out the word (remove centre letters).
'tummies' with its middle taken out is 'ts'.
Can you help me to learn more?