Cocktail carrier (7)
I believe the answer is:
sidecar
This could be a double definition.
'cocktail' is the first definition.
(sidecar is a kind of cocktail)
'carrier' is the second definition.
The answer and definition can be both man-made objects as well as being singular nouns.
Perhaps there's a link between them I don't understand?
Can you help me to learn more?
(Other definitions for sidecar that I've seen before include "Alcoholic drink" , "Where a passenger may go" , "Motorcycle accessory -- cocktail" , "Attachment on motorcycle to carry passenger" , "Appendage to motor cycle" .)