The most common and most likely answer to this crossword clue is the 6 plus 3 letter word SAVILE ROW
I've seen this crossword clue in Independent
S
A
V
I
L
E
R
O
W
More clues leading to the result SAVILE ROW
- Son has a nasty argument: he may be suited here
- Might this way suit you?
- Unpleasant noise follows when coming up London street
- Source of habits? Observed adopting nastier ones at first
- Ending in fisticuffs, a very bad argument in a Mayfair street
- Place that may suit one in Mayfair?
- London street proverb about poor Oliver
- Has a very bad argument from which expensive suit may come
- A nasty argument chasing last of buskers from a London street
- Saw Oliver Twist on street where one can suit oneself?
Buddy explains!
The straight part
We know that "Source of habits?" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case source of habits? = savile row.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.