### Clue: Will set-up subdue conservationists? (9)
### Answer: TESTAMENT 
 ### Explanation: Definition: Will
  **Reversal of**(up, in a down clue) SET + TAME(to subdue,tone down,domesticate a wild or unruly being, eg. Shakespeare's Kate) + NT(abbrev. for the $$N$$ational $$T$$rust, an organisation dedicated to preserving,conserving the cultural or environmental treasures of a region.  First organisation was for England/Wales/N.Ireland, but now similar ones are to be found in other regions and countries.