Being from another planet burrowed into immense surface (8)
I believe the answer is:
cosmetic
'surface' is the definition.
(cosmetic can mean on the surface)
'being from another planet burrowed into immense' is the wordplay.
I cannot quite see how this works, but
'being' could be 'metic' (metic is a kind of being) and 'metic' is present in the answer.
'from' could be 'o' (I've seen this in other clues) and 'o' is found in the answer.
This may be the basis of the clue (or it may be nonsense).
Can you help me to learn more?
(Other definitions for cosmetic that I've seen before include "Substance for beautifying the face (8)." , "better looks" , "Aesthetic rather than necessary, surgery perhaps" , "Superficial - lipstick, say" , "Preparation designed to beautify the body" .)