The most common and most likely answer to this crossword clue is the 7 letter word PARAPET
P
A
R
A
P
E
T
More clues leading to the result PARAPET
- Favoured a tap inside as protection from fire
- Airborne soldier standing on favourite part of fortification
- Do like to put in some defensive work
- Defence of area: exercises in sector
- Head is safer with full protection from this
- Primate in role, as protection against the enemy?
- Primate protected by section in this low wall
- Trap ape playing by a low wall
- Soldier favoured fortification
- Clumsy person breaking section in wall
Buddy explains!

The straight part
We know that "Wall which protects" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case wall which protects = parapet.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 PARAPET mean?
PARAPET noun- A low protective wall.
- Part of a perimeter that extends above the roof.
- A fortification consisting of a wall.