Do you want the climber to actually climb up the fence or be in front of the fence?

to climb over the fence preferably

Assuming the fence is yours to grow something over Clematis montana (will need some netting attached to the fence to climb up) or one of the Lonicera's not Wisteria which would likely bring the whole fence down! If the fence isn't yours then you can't grow anything actually on it but will need a trellis in front of.

You could maybe grow a spiky shrub in front of the hole to prevent anything coming through........

thanks for help,the fence is my daughters and clematis montana would be a lovely covering i will get some trellis first. i am her gardener!!