Favourite part of Cape Town (3)
I believe the answer is:
pet
'favourite' is the definition.
(synonyms)
'part of cape town' is the wordplay.
'part of' indicates the answer is hidden within the clue.
'PET' is hidden within 'cape town'.
(Other definitions for pet that I've seen before include "Preferred" , "Tamed animal; sulk" , "Favourite; fit of the sulks" , "Cat or dog" , "blue-eyed boy?" .)