have you hooked any "extra" accessories to the "clk ltr" circuit? if so, maybe you are taxing the circuit near capacity before you ever engage the lighter. OR use a flashlight and make sure there isnt some little piece of funk in the hole ....blow some compressed air in it to make sure. OR is it the correct lighter for the receptacle? AND has it worked well in the past? OR sometimes, those metal "tangs" inside the receptacle can get bent (from plugging something into the lighter receptacle) making the lighter short out the next time it is used. take the lighter from another car and try it. see if it also blows the fuse. try your lighter in the other car also. see if the problem stays with your car or moves with your lighter. if the other cars lighter dont blow your fuse, then you may have a bad lighter. if it does blow a fuse you may have a tweaked receptacle. ALSO use only th correct rated fuse every time you replace the fuse. keep us posted.