Crossword Genius

Make throaty call in Tesco occasionally (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 cannot understand how they can define each other.

'in tesco occasionally' is the wordplay.
'in' indicates the answer is hidden within the clue.
'COO' is hidden in the letters of 'tesco occasionally'.

Can you help me to learn more?

(Other definitions for coo that I've seen before include "Murmur amorously" , "Breathe" , "Sound made by doves" , "Soft murmuring sound of a pigeon" , "Avian sound" .)

I've seen this clue in The Sun.
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