Screen wild unknown landscape (7)
I believe the answer is:
scenery
'landscape' is the definition.
(both can mean natural surroundings)
'screen wild unknown' is the wordplay.
'wild' indicates anagramming the letters.
'unknown' becomes 'y' (algebra).
'screen' is an anagram of 'scener'.
'scener'+'y'='SCENERY'
(Other definitions for scenery that I've seen before include "Pleasant vista or play backdrop" , "sight" , "Theatrical background" , "Picturesque view or stage dicor" , "Stage setting" .)