Favourite part of Peterborough (3)
I believe the answer is:
pet
'favourite' is the definition.
(synonyms)
I don't understand the rest of the clue.
Can you help me to learn more?
(Other definitions for pet that I've seen before include "Favourite, favoured one" , "Paddy" , "Darling; fit of sulks" , "Animal as a companion" , "Tame animal kept for companionship" .)