Cigarette holder, perhaps (4)
I believe the answer is:
case
'cigarette holder' is the definition.
(I've seen this in another clue)
I can't explain the rest of the clue.
Can you help me to learn more?
(Other definitions for case that I've seen before include "jacket, for example" , "Box of twelve bottles of wine" , "Reconnoitre" , "Legal action; container" , "Wine buyer's quantity - dative, for example" .)