Where you must go if you get time (6)
I believe the answer is:
prison
'where you must go if you get time' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
This is all the clue.
Can you help me to learn more?
(Other definitions for prison that I've seen before include "Place of confinement" , "Place of detention for criminals" , "Correctional institution" , "Wormwood Scrubs, for example" , "punishment" .)