Twin raised to share (6,2)
I believe the answer is:
double up
'share' is the definition.
(double up can mean to share a bed)
'twin raised' is the wordplay.
'twin' becomes 'double' (identical twins are each other's doubles).
'raised' becomes 'up' (similar in meaning).
'double'+'up'='DOUBLE UP'
'to' is the link.
(Other definitions for double up that I've seen before include "React to punch in gut" , "have a room-mate" , "Share quarters" , "Crumple with pain; share room" , "Bend forward in pain or laughter" .)