I have a Dick Clark rose bush it is three years ols. it died last winter in the cold, this summer it is growing well but getting long and spindly, can i cut it back now and still get buds and roses before frost sets in.

This is a grafted rose, and as such, if the top portion grafted onto the rootstock dies, only the rootstock sends out new growth. Generally these canes are spindly, grow excessively long, and may or may not flower. If they do flower, the flowers look more like a wild type - only 1 to 2 inches across. Cutting them back will not induce them to produce the Dick Clark roses. Sometimes there is a mix of canes - some from the rootstock and some from the scion, but that doesn't sound like it from your description. If so, cutting out the reverted canes is the answer. But if you don't have any of the scion wood, the only solution is to remove the plant. Grafted roses need protection in the winter to keep the graft union from being winterkilled.

so that being said should i cut the new spindly canes back and see what happens or should i get rid of the new canes and keep the older canes?

Any of the spindly ones should be cut back to the crown. If there are older canes, you can keep them and see what happens. You should've had flowers by now if the grafted portion was okay.