Favourite trumpet piece (3)

I believe the answer is:

pet

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

'favourite' is the definition.
(synonyms)

'trumpet piece' is the wordplay.
'PET' is hidden in amongst the letters.
But, I'm uncertain how this is indicated.

Can you help me to learn more?

(Other definitions for pet that I've seen before include "Favourite or house animal" , "Favourite, darling" , "Domesticated animal" , "Tamed domestic animal" , "Tame animal kept for companionship" .)

I've seen this clue in the Evening Standard.

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