Concerned with stars describing film that's superficial (8)
I believe the answer is:
cosmetic
'superficial' is the definition.
(I've seen this before)
'concerned with stars describing film' is the wordplay.
I cannot quite understand how this works, but
'film' could be 'et' (E.T. the Extra-Terrestrial) and 'et' is found in the answer.
The remaining letters 'cosmic' is a valid word which might be clued in a way I don't see.
This may be the basis of the clue (or it may be nonsense).
'that's' is the link.
Can you help me to learn more?
(Other definitions for cosmetic that I've seen before include "Facial preparation" , "With surface effect only" , "Used to beautify face etc." , "Good for appearances only" , "Eg, make-up item" .)