### Clue: Aardvarks are very hard to confine in storage building (5-4)
### Answer: EARTH HOGS 
 ### Explanation: Definition: Aardvarks
An envelope (to confine in') of HH ('very hard' of pencils) in EARTOGS, an anagram ('building') of 'storage'. THe answer is a translation of the derivation of 'aardvarks'.