The most common and most likely answer to this crossword clue is the 6 letter word TANTRA
I've seen this crossword clue in The Times
T
A
N
T
R
A
More clues leading to the result TANTRA
- Religious text used by militant radicals
- Yellowish-brown paintings maybe recalled religious writings
- Bronze sculptures perhaps turned round to reveal mystical text
- Sacred texts of distant races
- Tibetan tradition, to some extent?
- Bronze sculpture perhaps reflected holy writings
- Religious instruction received by militant Rajputs
- Brown paintings maybe turning up in religious literature
- Blast on the horn when releasing a religious work
- Turning up are Old King Cole’s religious writings
Buddy explains!

The straight part
We know that "religious writings" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case religious writings = tantra.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 TANTRA mean?
TANTRA noun- A Hindu or Buddhist religious or esoteric text.