The most common and most likely answer to this crossword clue is the 7 letter word LEAN-TO
I've seen this crossword clue in The Guardian
L
E
A
N
-
T
O
More clues leading to the result LEAN-TO
- Penthouse for thin couple, say
- Outbuilding quietly removed from Greek battle site
- Ale not surprisingly found in shed
- Shed in field not being moving
- Worker in house or outbuilding
- Italian in no great hurry, locking up a shed?
- Building‘s unprofitable, as well as lacking love
- Sign that insect’s invaded shed
- Supported building, somewhere youth can go, as Spooner might have it
- Essential to dismantle Antonio’s shed
Buddy explains!

The straight part
We know that "shed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case shed = lean-to.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 LEAN-TO mean?
LEAN-TO noun- A shelter with a sloped roof; also a building with a similar construction attached to the side of a building as an extension.