Nick Dougherty, Alastair Forsyth and Thomas Levet all battled well to finish on 10 under on a day when strong winds and drivingrain forced a five-hour delay in play at the County Louth course.
Drivingrain and a swirling wind had ensured that this was no example of the beautiful game, but Rangers manager Walter Smith will like the look of the way they managed to grind out the three points needed to maintain their challenge at the top of the Scottish Premier League.
In drivingrain and on a heavy pitch, Clermont soon showed their intent with a forward rumble into the home 22 which saw the ball moved to Ledesma, who went over.