Gets there to find the rosters on display (5,2)

I believe the answer is:

rolls up

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'gets' is the definition.
The answer and definition can be both related to change as well as being verbs in their -s form.
Maybe there's an association between them I don't understand?

'there to find the rosters on display' is the wordplay.
I cannot quite see how this works, but
'rosters' could be 'rolls' ('roll' can be a synonym of 'roster') and 'rolls' is found within the answer.
The remaining letters 'up' is a valid word which might be clued in a way I don't see.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for rolls up that I've seen before include "Appears" , "Arrives" .)

I've seen this clue in the Evening Standard.

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