Material from planet earth excitedly probed by returning alien (6,7)
I believe the answer is:
patent leather
'material' is the definition.
(type of leather)
'planet earth excitedly probed by returning alien' is the wordplay.
'excitedly' indicates an anagram.
'probed by' indicates putting letters inside (I've seen this in other clues).
'returning' says the letters should be written backwards.
'alien' becomes 'et' (extra terrestrial).
'et' backwards is 'te'.
'planet'+'earth'='planetearth'
'planetearth' with letters rearranged gives 'pantleather'.
'pantleather' enclosing 'te' is 'PATENT LEATHER'.
'from' acts as a link.
(Other definitions for patent leather that I've seen before include "Glossy shoe material" , "Varnished hide" , "shiny skin" , "Tanned animal skin made hard and glossy" , "it will present a varnished surface" .)