Clairvoyance with detailed ceremony seeing spirit (6)
I believe the answer is:
esprit
'spirit' is the definition.
(I know that esprit is a type of spirit)
'clairvoyance with detailed ceremony' is the wordplay.
'clairvoyance' becomes 'esp' (synonyms).
'with' says to put letters next to each other.
'detailed' means to remove the last letter (the word must be end-less or 'de-tailed').
'ceremony' becomes 'rite' (rite is a kind of ceremony).
'rite' with its last letter removed is 'rit'.
'esp'+'rit'='ESPRIT'
'seeing' is the link.
(Other definitions for esprit that I've seen before include "Liveliness of mind or spirit" , "Liveliness - priest (anag)" , "French morale as in de corps?" , "Sprightliness" , "Sparkling quality" .)