Rod's tipple laced with unknown ingredient (4)
I believe the answer is:
axle
This might be a double definition.
'rod's' is the first definition.
(axle is a kind of rod)
'tipple laced with unknown ingredient' is the second definition.
Although both the answer and definition are singular nouns, I cannot see how one could define the other.
Can you help me to learn more?
(Other definitions for axle that I've seen before include "Rod making wheels turn" , "Shaft used for rotation" , "Rotating rod carrying wheels" , "Rod of wheelbase" , "Bar on which wheel revolves" .)