That's an easy one .. It happens to me all the time ... What i do is this
i get a sharp knife and carv away plastic around the broken pin .In order to get more support area .. Then i use good quality solder and attach a pin or a piece of good copper wire ..Trying to get a good solder point with the less amount of solder and HEAT!
What I already did but cost the price of good IC socket (tulip type).
Plug you IC in the socket, carve like eltonjhon explain the plastic and solder a wire from the broken pin to the place where the pin should be inserted and solder a few or all other pins and you have again a "solid" IC.
i do it many times in R&D, scrap it as told by eltonjohn, then use a very fine guage of wire and loop it in the scraped area and solder it . it will form a Ball like in a ball grid array ic. then solder a 4148 pin to it and put some araldite.