Crossword Genius

Make throaty call in disco obvious (3)

Ross

I believe the answer is:

coo

I'm a little stuck... Click here to teach me more about this clue!

'make throaty call' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.

'in disco obvious' is the wordplay.
'in' indicates the answer is hidden within the clue.
'COO' is hidden in the letters of 'disco obvious'.

Can you help me to learn more?

(Other definitions for coo that I've seen before include "Sound made by a pigeon" , "Sound made by dove" , "Gosh!" , "Avian sound" , "Murmur amorously" .)

I've seen this clue in The Sun.
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