Most preferred (3)
I believe the answer is:
pet
'most preferred' is the definition.
(I've seen this in another clue)
This is the entire clue.
(Other definitions for pet that I've seen before include "blue-eyed boy?" , "Favourite, perhaps a domestic animal" , "Bad humour; darling" , "Darling; fit of sulks" , "Favourite pupil" .)