An odd owl disrupting tree-covered area (8)
I believe the answer is:
woodland
'tree-covered area' is the definition.
(I've seen this in another clue)
'an odd owl disrupting' is the wordplay.
'disrupting' indicates an anagram.
'an'+'odd'+'owl'='anoddowl'
'anoddowl' is an anagram of 'WOODLAND'.
(Other definitions for woodland that I've seen before include "sylvan scene" , "scene in nature" , "Forest" , "Area covered with trees and shrubs" , "undeveloped site" .)