Clerarcha agana is a moth in the Xyloryctidae family. It was described by Meyrick in 1890. It is found in Australia, where it has been recorded from South Australia and Western Australia. The wingspan is 15-18 mm. The forewings are white, irrorated with dark ochreous-grey, the dorsal half suffused with pale grey and with four small roundish cloudy rather dark grey spots, the first three arranged in a longitudinal row in the disc at one-third, half, and two-thirds, the fourth directly beneath the third. The hindwings are pale whitish-grey.