### Clue: One close to Blunkett's heart taking marijuana as a writing aid (6)
### Answer: INKPOT 
 ### Explanation: Definition: a writing aid
 I(Roman numeral for "One") **plus**(close to) NK[middle letters of (…'s heart) Blunkett] **plus**(taking) POT(slang for the drug marijuana).
Answer:  Not many of these around nowadays.