The most common and most likely answer to this crossword clue is the 10 letter word SCRAMBLING
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More clues leading to the result SCRAMBLING
Buddy explains!

The straight part
We know that "Off-road racing that is circuitous" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case off-road racing that is circuitous = scrambling.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 SCRAMBLING mean?
SCRAMBLING verb- To move hurriedly to a location, especially by using all limbs against a surface.
- To proceed to a location or an objective in a disorderly manner.
- (of food ingredients, usually including egg) To thoroughly combine and cook as a loose mass.
- To process (telecommunication signals) to make them unintelligible to an unauthorized listener.
- To quickly deploy (vehicles, usually aircraft) to a destination in response to an alert, usually to intercept an attacking enemy.
- To be quickly deployed in this manner.
- To partake in motocross.
- To ascend rocky terrain as a leisure activity.
- To gather or collect by scrambling.
- To struggle eagerly with others for something thrown upon the ground; to go down upon all fours to seize something; to catch rudely at what is desired.
- To throw something down for others to compete for in this manner.
- An act of scrambling.
- Confused and irregular; awkward; scambling.
- Having a stem too weak to support itself, instead attaching to and relying on the stems or trunks of stronger plants.