If it was only the threads then the biggest danger would be from bristle worms and other scavengers attacking the clam from underneath as they detect the damaged tissue. Keep it in the rockwork so nothing can get underneath of it and keep a close eye on it. Alternatively, you can create a shield for it by pressing the bottom of the clam into some still soft aquarium epoxy and then putting the clam on top when it hardens. The perfect mould you create help prevent the baddies from getting underneath.
If, however, the entire byssal gland has been yanked out (you'd know it if you saw it), then the clam is probably toast.
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