The most common and most likely answer to this crossword clue is the 7 letter word BROTHER
I've seen this crossword clue in The Daily Telegraph
B
R
O
T
H
E
R
More clues leading to the result BROTHER
- Trouble engulfing Republican family member
- Lib ranter who upset one of the extended family
- See 16ac.
- Relative torpor ultimately probing knickers
- Pottage offered with little hesitation – by one to another?
- Monk perhaps runs into trouble
- Trade unionist perhaps runs into trouble
- Harry embracing Rex as comrade
- Ally‘s trouble about end of war
- One of the family runs into trouble
Buddy explains!

The straight part
We know that "Monk perhaps" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case monk perhaps = brother.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 BROTHER mean?
BROTHER noun- Son of the same parents as another person.
- A male having at least one parent in common with another (see half-brother, stepbrother).
- A male fellow member of a religious community, church, trades union etc.
- A form of address to a man.
- A black male.
- Somebody, usually male, connected by a common cause or situation.
- Someone who is a peer, whether male or female.
- To treat as a brother.
- Expressing exasperation.