Crossword Genius

That favourite trumpet piece (3)

Ross

I believe the answer is:

pet

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

'that favourite' is the definition.
(synonyms)

'trumpet piece' is the wordplay.
'PET' is hidden in amongst the letters.
But, I am unsure how the hidden word is indicated.

Can you help me to learn more?

(Other definitions for pet that I've seen before include "Bad humour; darling" , "Favourite, darling" , "blue-eyed boy?" , "Caress or fondle, as with favourite" , "Tame animal kept for companionship" .)

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