### Clue: Ultra-conservative Elmer, perhaps useless, departs within two years (5-5)
### Answer: FUDDY-DUDDY 
 ### Explanation: Definition: Ultra-conservative
 FUDD(Elmer, the antagonist of Bugs Bunny in the Looney Tunes cartoons) + < [ DUD(useless) + D(abbrev. for "dead";departed from life) ] **contained in**(within) ***2 x***(two) Y(abbrev. for "year") >.