Favourite place to buy things you'll love (3,4)
I believe the answer is:
pet shop
'you'll love' is the definition.
Although both the answer and definition are singular nouns, I don't see how they can define each other.
'favourite place to buy' is the wordplay.
'favourite' becomes 'pet' (synonyms).
'place to buy' becomes 'shop' (I've seen this before).
'pet'+'shop'='PET SHOP'
'things' is the link.
Can you help me to learn more?
(Other definitions for pet shop that I've seen before include "Where to buy hamsters and gerbils?" , "Scene of boys and cat food" , "musical boys" , "Where to buy hamsters - boys!" , "Boys in group" .)