The most common and most likely answer to this crossword clue is the 7 letter word PALADIN
I've seen this crossword clue in The Daily Telegraph
P
A
L
A
D
I
N
More clues leading to the result PALADIN
- Former champion from China, these days at home
- Damsel endlessly in distress? Here’s a knight in shining armour
- Arrant knight, young man in grip of anguish
- Boy in distress becomes a champion
- Suffering that boy’s held in, a paragon of good behaviour
- Young man breaking bread for French champion
- Peer, seeing a young man entering security number
- Knight errant, young fellow suffering torture, it seems
- Hurt fencing juvenile champion
- 7 Knight makes father take boy to one nook first
Buddy explains!

The straight part
We know that "Peer" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case peer = paladin.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 PALADIN mean?
PALADIN noun- A heroic champion (especially a knightly one).
- A defender or advocate of a noble cause. (A defender of faith).
- Any of the twelve Companions of the court of Emperor Charlemagne.