Crossword Genius

Collection of people having no right to enter university (2,2)

Ross

I believe the answer is:

go up

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

'collection of people' is the definition.
The answer and definition can be both related to change as well as being verbs in their base form.
Maybe there's a link between them I don't understand?

'no right to enter university' is the wordplay.
I cannot quite understand how this works, but
'no' could be 'o' (O resembles 0) and 'o' is located in the answer.
'university' could be 'u' (abbreviation for university) and 'u' is located in the answer.
The remaining letters 'gp' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

'having' is the link.

Can you help me to learn more?

(Other definitions for go up that I've seen before include "Rise" , "get promoted" .)

I've seen this clue in The Times.
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