### Clue: Uncle's cut off a cactus? (9)
### Answer: SUCCULENT 
 ### Explanation: Definition: a cactus?
An anagram ('off') of 'uncles cut', with a question mark for the indication by example (most cacti are succulents, in that they are adapted for storage of water, but, horticulturally, the word succulent is often used specifically to exclude cacti).