The most common and most likely answer to this crossword clue is the 5 letter word FRIAR
I've seen this crossword clue in The Times
F
R
I
A
R
More clues leading to the result FRIAR
- A long way round a state for itinerant
- Inhalant supplied to order?
- Retiring manner adopted by father's brother
- Brother or father adopting elevated bearing
- Day ends in anger for Dominican, perhaps
- Heard someone cooking chips, perhaps for brother
- Monk in a river, succeeding when he gets fish, in short?
- Day ends in anger for Dominican perhaps
- Religious instruction accepted by distant monk
- Day cleaning out interĀior of antechamber gets one in order
Buddy explains!

The straight part
We know that "Brother" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case brother = friar.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 FRIAR mean?
FRIAR noun- A member of a mendicant Christian order such as the Augustinians, Carmelites (white friars), Franciscans (grey friars) or the Dominicans (black friars).
- A white or pale patch on a printed page.
- An American fish, the silverside.