### Clue: Urn, not too big, cost nothing: goodness, a snip (9)
### Answer: VASECTOMY 
 ### Explanation: Definition: snip
VASE="Urn" + C-[**os**]-T + O="nothing" + MY=exclamation of surprise="goodness" 
"not too big" indicates the removal of **os** (over size) from "cost"