The most common and most likely answer to this crossword clue is the 7 letter word CASSOCK
I've seen this crossword clue in Independent
C
A
S
S
O
C
K
More clues leading to the result CASSOCK
- Strutting leader, idiot in that long garment
- Clerical garment found with odd items of classy clobber
- Early riser catches fool in clerical attire
- What clergy wear suit mostly needing belt?
- . Habit of fool chopping hay
- Habit of putting animal in haystack
- Caught ship commander stealing a knight's garment
- Coat barrel stuffed with rolled leaves
Buddy explains!

The straight part
We know that "clerical attire" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case clerical attire = cassock.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 CASSOCK mean?
CASSOCK noun- A military cloak or long coat worn by soldiers or horsemen in the 16th and 17th centuries.
- A coarse, loose cloak or gown, worn by women, sailors, shepherds, countryfolk etc.
- An item of clerical clothing: a long, sheath-like, close-fitting, ankle-length robe worn by clergy members of some Christian denominations.