Gin or rum? Be frank: this is scarcely bubbly at all (6,5)
I believe the answer is:
spirit level
This might be a double definition.
'gin' is the first 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?
'rum? be frank this is scarcely bubbly at all' is the second definition.
The definition suggests a singular noun which matches the answer.
'or' is the link.
Can you help me to learn more?
(Other definitions for spirit level that I've seen before include "Horizontality checker with a bubble" , "Carpenter's tool" , "Means of checking horizontality" , "useful for evening out" , "Device" .)