Crossword Genius

A starting place for correction treatment (7)

Ross

I believe the answer is:

borstal

I'm a little stuck... Click here to teach me more about this clue!

This could be a double definition.

'a starting place' is the first definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.

'correction treatment' 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?

'for' is the link.

Can you help me to learn more?

(Other definitions for borstal that I've seen before include "Old institution" , "Former youth prison" , "Formerly, prison for young offenders" , "Former detention establishment" , "Detention centre" .)

I've seen this clue in the Evening Standard.
Want a hint initially instead of a full solution? Install my app