That favourite trumpet piece (3)
I believe the answer is:
pet
'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" .)