Clyde avoided the drop to Division Two with a fine two-goal victory over Airdrie United for a convincing aggregate win in their play-off.
Airdrie goalkeeper Stephen Robertson pulled off a couple of fine saves, while Allan Russell missed a couple of chances at the other end.
But Gary McSwegan pounced on a long ball from Marvyn Wilson to fire Clyde into the lead after the break.
And Pat Clarke headed home to ensure Clyde's place in Division One.
Airdrie, who finished second in the Second Division, could yet be given a promotion lifeline if Gretna go out of business following their relegation from the Scottish Premier League.
Clyde manager John Brown had been inspired by a pre-match phone call from Rangers manager Walter Smith.
"He told us we were one-nil up from the first leg and that we just had to defend, like Rangers have done in Europe," he said.
"Airdrie came at us and caused us problems in the first half, but we were much better in the second and I knew the first goal would be important.
"In saying that, they should have had a penalty that could have changed the way the game was going, but we are just happy to survive.
"Pat Clarke has been fantastic for us. He came from a lower league when we lost Dougie Imrie in January, but he has scored eight goals for us and has played a big part in us staying in the First Division.
"Experienced players like Marvyn Wilson, Jorg Albertz and Gary McSwegan have helped the young players and done their part too."
Clyde: Hutton, Neil McGregor, Higgins (Michael McGowan 71), Masterton, Ruari MacLennan, Wilson, James Gibson, William Gibson, Bradley, McSwegan (Arbuckle 56), Clarke, Arbuckle (McKay 83). Subs Not Used: Bestvina, Cherrie.
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