You can live with a a failed PTO clutch, not life or death, just have to be cognizant that the stub will always rotate (from parasitic friction) that the clutch brake overcomes and stops. Consequently, when attaching an implement, STOP the engine ENGAGE the PTO lever with the tractor in NEUTRAL and hook it up. The implement not engaged will keep the PTO from rotating (probably slowly maybe) until you engage the PTO drive. It's not the end of the world by any means, but if you do fix it, get yourself an Over Running Coupler and install it on the PTO shaft and then hook up your implement.
The over running clutch is simply a ratcheting clutch that allows any implement that don't have a built in one way clutch (which most all shredders and mowers don't) to freewheel without driving the PTO stub and destroying the clutch itself. Tractor supply has them and I don't know what your PTO power is but I bought mine from Allied Tractor Supply online because the ones at TS are not rated for the PTO output I have. Most are rated for under 50 horsepower, mine is rated at 100 horse PTO output and they are internally greaseable as well. I did have to shorten my implement's PTO shafts a bit on both my flat back Land Pride shredder as will as my Land Pride bat wing because the over running coupler adds about 6" to the overall shaft length. No big deal however. You don't want the driven PTO to not have articulating clearance or it will eat up your stub shaft seal and possibly the internal drive as well.
Good luck...