### Clue: Monstrosity of old yard covered in swill (8)
### Answer: GARGOYLE 
 ### Explanation: Definition: Monstrosity
 [ O(abbrev. for "old") + Y(abbrev. for "yard", as a unit of distance) ] **contained in**(covered in) GARGLE(to swill/to wash and rinse, in this case, one's mouth, with liquid).