Possible Clues:

• Used to get to run back in there, that is to say
• Accustom (someone) to something unpleasant
• Where R might get used?
• Train that is about to speed up
• Prepare for the worst
• Get used to the ruin over the East
• One to take note after railwaymen harden attitude
• Get used to one health-worker, not second
• Harden against
• Harden in water in Yorkshire