Klemtu Passage is very scenic and worth transiting even if you don’t intend stopping in Klemtu.
On paper Clothes bay, a mile to the south of Klemtu looks as if it should be a snug anchorage. However, a surprising amount of wind seems to funnel through from the south if the wind is in that sector. Furthermore at the time of our visit in Jun 2018 the bay was littered with semi submerged logs, embedded in the mud but protruding above water and we judged there would be a high risk of fouling an anchor.
It would be possible to anchor in the bay at Klemtu itself but it appeared slightly deeper than the chart suggests and a long scope would be needed.