Covering brought back in order to cover the hole (4)
I believe the answer is:
roof
'covering' is the definition.
(roof is a kind of covering)
'brought back in order to cover the hole' is the wordplay.
'brought back' says the letters should be written in reverse.
'in order to' becomes 'for' (I can't explain this - if you can you should believe this answer much more).
'cover' is an insertion indicator.
'the hole' becomes 'O'.
'for' going around 'o' is 'foor'.
'foor' backwards is 'ROOF'.
Can you help me to learn more?
(Other definitions for roof that I've seen before include "Top outside covering" , "Cover for house" , "Topmost part" , "Top covering of a building or vehicle" , "House's top" .)