The most common and most likely answer to this crossword clue is the 8 letter word HABITUAL
I've seen this crossword clue in The Daily Telegraph
H
A
B
I
T
U
A
L
More clues leading to the result HABITUAL
- Roughly haul about somewhat, as usual
- Customary attire: undies and loose tops
- Traditional halibut prepared with aïoli for starter
- It is customary to cook a halibut
- Somewhat united in protection of King Henry as usual
- Customary problem user has upgrading ageing laptops primarily
- It’s customary for a halibut to be stewed
- Husband regularly unable to follow a small part of routine
- Inveterate and bluff king keeps somewhat unfriendly at first
- Ordinary, slightly in drag, having change of heart
Buddy explains!

The straight part
We know that "Usual" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case usual = habitual.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 HABITUAL mean?
HABITUAL noun- One who does something habitually, such as a serial criminal offender.
- (grammar) A construction representing something done habitually.
- Of or relating to a habit; established as a habit; performed over and over again; recurrent, recurring.
- Regular or usual.
- Of a person or thing: engaging in some behaviour as a habit or regularly.
- (grammar) Pertaining to an action performed customarily, ordinarily, or usually.