Rugby names about to mount support for injured cricketer (6)

I haven't cracked this one yet — but the brilliant team at Fifteensquared have:

RU (abbreviation for Rugby Union) + N N (two N = abbreviation for name, so “names”), then RE (about = on the subject of) reversed (to mount = upwards in a down clue). As in Law 25 of the Laws of Cricket: if a batter is injured and unable to run (but can still bat), another member of the team can be nominated as a “runner” to run between the wickets when required. Runners are no longer permitted in international cricket, but may be used in domestic games.