The most common and most likely answer to this crossword clue is the 8 letter word TUMBLING
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More clues leading to the result TUMBLING
Buddy explains!

The straight part
We know that "Falling" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case falling = tumbling.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 TUMBLING mean?
TUMBLING verb- To fall end over end; to roll over and over.
- To perform gymnastics such as somersaults, rolls, and handsprings.
- To drop rapidly.
- To smoothe and polish, e.g., gemstones or pebbles, by means of a rotating tumbler.
- To have sexual intercourse.
- To move or rush in a headlong or uncontrolled way.
- To muss, to make disorderly; to tousle or rumple.
- (cryptocurrency) To obscure the audit trail of funds by means of a tumbler.
- The act of something that tumbles.