Crossword Genius

Twin at university to share room (6,2)

Ross

I believe the answer is:

double up

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'share room' is the definition.
'double up' can be an answer for 'share' (double up can mean to share a bed). I am not sure about the 'room' bit.

'twin at university' is the wordplay.
'twin' becomes 'double' (identical twins are each other's doubles).
'at university' becomes 'up' ('up' can mean studying at university).
'double'+'up'='DOUBLE UP'

'to' is the link.

Can you help me to learn more?

(Other definitions for double up that I've seen before include "have a great laugh" , "Couple" , "win?" , "Look pained" , "Bend forward in pain or laughter" .)

I've seen this clue in The Sun.
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