The most common and most likely answer to this crossword clue is the 9 letter word THATCHING
I've seen this crossword clue in The Daily Telegraph
T
H
A
T
C
H
I
N
G
More clues leading to the result THATCHING
- Architect ultimately devising natural alternative to tiles
- Obsession about attending church, getting a job in the country?
- This goes without his planning cover for house
- Yon feature — good for covering roof!
- Home cover plan limited by interminable suspicion
- Tamil leader developing roofing material
- Roofing material that China reduced by a thousand dollars
Buddy explains!

The straight part
We know that "cover for house" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case cover for house = thatching.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does THATCHING mean?
THATCHING verb- To cover the roof with straw, reed, leaves, etc.
- Bundles of hay or straw used to make a roof.
- The act or art of covering with thatch.