The Paul-L De-Clicker plugin* does do a good job , but takes its time. With the settings shown below the processing time is approximately three times the play back time …
[ * Audacity does not come with Paul-L’s deClicker installed , you can get a copy of it from here : the “Declicker.ny” file at the bottom of the post . Put a copy of that “Declicker.ny” file into Audacity’s plugins folder , then it can be included in Audacity’s “Effect” list via “manage” at the top of the effect list ].