Rent imbalance sidelined an elder, still? (7)
I believe the answer is:
alembic
'still?' is the definition.
(I know that alembic is a type of still)
I cannot understand how the rest of the clue works.
Can you help me to learn more?
(Other definitions for alembic that I've seen before include "Old retort" , "Old distillation vessel" , "Still" .)