### Clue: Intend shortly to enclose grey brain part (7)
### Answer: MEDULLA 
 ### Explanation: Definition: brain part
 "mean"(to intend/aim to serve a purpose) **minus ****its last letter**(shortly) **containing**(to enclose) DULL(grey/lacking brightness).
Answer: Short for "medulla oblongata", the lowest part of the brain stem.