### Clue: Fuss after removing covers, scary agent cut diamond (9)
### Answer: CARBONADO 
 ### Explanation: Definition: diamond
 ADO(fuss;bother) **placed below**(after, in a down clue) [ "scary " **minus its 1st and last letters**(removing covers) + "Bond"(James, fictional secret agent) **minus its last letter**(cut) ].
Answer: An inferior variety of diamond used for polishing and drilling, aka black diamond.