The most common and most likely answer to this crossword clue is the 6 plus 1 letter word SADHU} –
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Buddy explains!

The straight part
We know that "ascetic" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case ascetic = sadhu} –.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 SADHU} – mean?
SADHU} – noun- An ascetic or practitioner of yoga (yogi) who has given up pursuit of the first three Hindu goals of life: kama (enjoyment), artha (practical objectives) and even dharma (duty).