The most common and most likely answer to this crossword clue is the 6 letter word CANTER
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More clues leading to the result CANTER
Buddy explains!

The straight part
We know that "Pace" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case pace = canter.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 CANTER mean?
CANTER noun- A gait of a horse between a trot and a gallop, consisting of three beats and a "suspension" phase, where there are no feet on the ground. Also describing this gait on other four legged animals.
- A ride on a horse at such speed.
- To move at such pace.
- To cause to move at a canter; to ride (a horse) at a canter.
- One who cants or whines; a beggar.
- One who makes hypocritical pretensions to goodness; one who uses canting language.