Crossword Genius

Hooter essential for slow Lada (3)

Ross

I believe the answer is:

owl

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

'hooter' is the definition.
(I've seen this before)

'essential for slow lada' is the wordplay.
'OWL' is hidden within the letters.
However, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for owl that I've seen before include "Pussy-cat's wooer (Lear)" , "Traditionally wise bird" , "Someone solemn or wise or staying up at night" , "Athena's bird" , "Smuggle sheep" .)

I've seen this clue in The Telegraph.
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