The most common and most likely answer to this crossword clue is the 9 letter word BACK-HEEL
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Buddy explains!
The straight part
We know that "A swift kick to the rear" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case a swift kick to the rear = back-heel.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 BACK-HEEL mean?
BACK-HEEL noun- A kick played by the heel which typically travels in the opposite direction from which the player is facing.
- A method of tripping or throwing by getting the leg back of the opponent's heel on the outside and pulling forward while pushing his body back.
- To perform such a kick.
- To perform such a trip or throw.