Leaves, making a file go astray (7)
I believe the answer is:
foliage
'leaves' is the definition.
(I've seen this before)
'a file go astray' is the wordplay.
'astray' indicates anagramming the letters.
'a'+'file'+'go'='afilego'
'afilego' with letters rearranged gives 'FOLIAGE'.
'making' is the link.
(Other definitions for foliage that I've seen before include "(Decorative) leaves" , "Leaves of tree or plant" , "Greenery, leaves of trees or plants" , "Green leaves" , "Mass of leaves" .)