The most common and most likely answer to this crossword clue is the 11 letter word MONASTICISM
I've seen this crossword clue in The Daily Telegraph
M
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N
A
S
T
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M
More clues leading to the result MONASTICISM
Buddy explains!

The straight part
We know that "Way of life after getting into the habit" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case way of life after getting into the habit = monasticism.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.