Crossword Genius

It separates the section one can get into (9)

Ross

I believe the answer is:

partition

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

'it separates the section one can' is the definition.
The definition suggests a singular noun which matches the answer.

'into' is the wordplay.
I cannot quite understand how this works, but
an anagram of 'into' is 'tion' which is within the answer.
The remaining letters 'parti' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'get' is the link.

Can you help me to learn more?

(Other definitions for partition that I've seen before include "Separation (of a country) into separate nations" , "wall" , "Screen" , "Divide; divider" , "segregation" .)

I've seen this clue in the Evening Standard.
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