Light parts shine there already (8)
I believe the answer is:
ethereal
'light' is the definition.
(I've seen this in another clue)
'parts shine there already' is the wordplay.
'parts' indicates the answer is hidden within the clue (I've seen 'part of' mean this).
'ETHEREAL' is hidden within 'shine there already'.
(Other definitions for ethereal that I've seen before include "Having great lightness and delicacy" , "Very delicate - tale here (anag)" , "Fine" , "Having an unreal lightness or delicateness" , "Extremely delicate and light, not of this world" .)