All are clairvoyant but at different levels. All can develop clairvoyance with pathworking and intent.

Basal Clairvoyance occurs while we dream and imagine.
Developed Clairvoyance occurs during projection.
Skilled Clairvoyance begins to occur at will in meditation especially in trance.

Anyone can develop their clairvoyant ability through pathworking which includes ;
*routine deliberate cleansing of the human energy body through energy , asana(pose) and breath.

*maintaining a clear energy body through yoga, asana , energy work, breath, good thoughts, words and actions.

*creating a sacred chamber like a cauldron which will maintain and increase energy in pathworking

* drawing energy through the spinal/Tree of Life
Robert Bruce NEW & Energy Work are primers to begin energy work
Follow this with Initiation into Hermetics by Franz Bardon to learn to control influence and effluence of specific elemental energies.

* routine meditation
wear loose clothing
sit in sacred chamber
in dim light
in Throne or Thoth Asana
open in protection
close the physical eyes
drawing energy down the crown to the heart to the feet
draw energy up the feet through the legs to the heart to the brow centre

open the brow centre with intent by looking through the centre of the forehead
taking consciousness there and pushing energy from the core chakra
between the indigo and blue chakra

Sit in the silence of the now gathering energy and slowing the vital pulse and breath until trance is attained and peace is gathered , then begin.

Meditate, gather visions, project from the body, scry et cetera, as you will.