The most common and most likely answer to this crossword clue is the 4 letter word PACE
I've seen this crossword clue in The Times
P
A
C
E
More clues leading to the result PACE
- Tread, soft one
- With due reference to speed
- Virtuoso on piano to establish tempo
- Walk back from the Capitol
- Speed of expert under pressure
- Rate of progress one’s shown at foot of page
- Bill in gym showing speed of movement
- Speed pressure card
- … with due respect to Speed
- Piano expert politely expressing disagreement
Buddy explains!

The straight part
We know that "Tread" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tread = pace.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 PACE mean?
PACE noun- Step.
- Way of stepping.
- Speed or velocity in general.
- A measure of the hardness of a pitch and of the tendency of a cricket ball to maintain its speed after bouncing.
- (collective) A group of donkeys.
- Passage, route.
- To walk back and forth in a small distance.
- To set the speed in a race.
- To measure by walking.
- Describing a bowler who bowls fast balls.
- With all due respect to.
- Easter.