The most common and most likely answer to this crossword clue is the 6 letter word MYSTIC
I've seen this crossword clue in Independent
M
Y
S
T
I
C
More clues leading to the result MYSTIC
- Mongolia's first city's strangely enigmatic
- My wand nearly is involved in occult rites
- Like Meg to see City’s game with Mike initially
- Arcane criticism of setter is a little excessive
- Section of the army stick together in a mysterious way
- One meditating on Araucaria’s sophistication, at heart
- My critical comments not entirely representative of weird activities
- Wand in Paul’s hands not quite delivering magic
- Spiritual girl reported to have convulsion
- Arcane section of army stick together
Buddy explains!

The straight part
We know that "Spiritual" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case spiritual = mystic.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 MYSTIC mean?
MYSTIC noun- Someone who practices mysticism.
- Of, or relating to mystics, mysticism or occult mysteries; mystical.
- Mysterious and strange; arcane, obscure or enigmatic.