The most common and most likely answer to this crossword clue is the 8 letter word ANDERSON
I've seen this crossword clue in Financial Times
A
N
D
E
R
S
O
N
More clues leading to the result ANDERSON
- Shelter man and boy punched by queen
- Wartime shelter soon hides the German head of state
- An Open champion, with individual lacking power
- Man offering shelter and freedom to snore?
- Bowler contributing to Englanders’ onslaught
- Shelter from snakes? Not with me about
- English bowler moves around leg — wicket falls!
- Shelter with debris, occasionally drinking
Buddy explains!
The straight part
We know that "Wartime shelter" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wartime shelter = anderson.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.