The most common and most likely answer to this crossword clue is the 8 letter word STRIDING
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Buddy explains!
The straight part
We know that "Power walking" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case power walking = striding.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 STRIDING mean?
STRIDING verb- To walk with long steps.
- To stand with the legs wide apart; to straddle.
- To pass over at a step; to step over.
- To straddle; to bestride.
- The act of one who strides; a long step.
- A technique for propelling forward that appears similar to walking, where a foot slides forward on the opposite side of a pole being planted to provide a location to apply force.