### Clue: Sweet things happy to eat fish in shanty towns (10)
### Answer: SUGARPLUMS 
 ### Explanation: Definition: Sweet things
 [ UP(happy, in contrast to "down;sad") **containing**(to eat) GAR(or garfish, a slender freshwater fish) ] **contained in**(in) SLUMS(descriptive of shanty towns made up of crudely built shacks).