Chest cold carrier passing on bug originally (6)
I believe the answer is:
casket
'chest' is the definition.
(I have seen 'Small chest' mean 'casket' so perhaps 'chest' could also mean 'casket')
I cannot understand how the remainder of the clue works.
Can you help me to learn more?
(Other definitions for casket that I've seen before include "Small box for holding jewellery" , "Box for jewellery or ashes" , "Jewel-box" , "Ornamental box" , "Helping boost" .)