Snapper arrived with tailless ray (6)
I believe the answer is:
camera
'snapper' is the definition.
(cameras go snap)
'arrived with tailless ray' is the wordplay.
'arrived' becomes 'came' (come can mean to appear or arrive).
'with' is a charade indicator (letters next to each other).
'tailless' means to remove the last letter (the tail of the word is removed).
'ray' with its last letter taken off is 'ra'.
'came'+'ra'='CAMERA'
(Other definitions for camera that I've seen before include "Photographic apparatus" , "Light-proof box with a lens and film" , "Device for taking photographs" , "shooter" , "Snapper's kit" .)