Clairvoyant
late 17th century (in the sense ‘clear-sighted, perceptive’): from French, from clair ‘clear’ + voyant ‘seeing’ (from voir ‘to see’). The current sense dates from the mid 19th century.
wiktionary
From French clairvoyant, from clair(“clear”) + voyant(“seeing”), present participle of voir(“see”).
etymonline
clairvoyant (adj.)
"having psychic gifts, characterized by powers of clairvoyance," 1837, earlier "having insight" (1670s), from special use of French clairvoyant "clear-sighted, discerning, judicious" (13c.), from clair (see clear (adj.)) + voyant "seeing," present participle of voir, from Latin videre "to see" (from PIE root *weid- "to see"). Related: Clairvoyantly.
clairvoyant (n.)
1834 in the psychic sense, "person supposed to possess powers of clairvoyance;" see clairvoyant (adj.). Earlier it was used in the sense "clear-sighted person" (1794). Fem. form is Clairvoyante.
