Points to a blue arrangement in clouds (7)
I believe the answer is:
nebulae
'clouds' is the definition.
(I've seen this before)
'points to a blue arrangement' is the wordplay.
'points' becomes 'ne' (North and East).
'to' says to put letters next to each other.
'arrangement' indicates anagramming the letters.
'a'+'blue'='ablue'
'ablue' anagrammed gives 'bulae'.
'ne'+'bulae'='NEBULAE'
'in' acts as a link.
(Other definitions for nebulae that I've seen before include "Cloud-like patches in space" , "Gas or dust clouds in space" , "Stardust" , "Bright patches in sky from distant galaxies" , "Interstellar gas clouds" .)