The most common and most likely answer to this crossword clue is the 5 letter word RACED
I've seen this crossword clue in Independent
R
A
C
E
D
More clues leading to the result RACED
- Sprinted, heading off being tracked down
- Flew as fighter pilot, in a way
- Player finally beaten at tennis, ran
- Competed for best in street
- Quickly went to number one midway
- Competed for best in road
- Vacuous reverend injecting whizz was rushing
- Dashed artist died, buried in church? On the contrary
- Rushed ruddy sandwiches roughly over
- Shot radical outside church
Buddy explains!

The straight part
We know that "was rushing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case was rushing = raced.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 RACED mean?
RACED verb- To take part in a race (in the sense of a contest).
- To compete against in such a race.
- To move or drive at high speed; to hurry or speed.
- Of a motor, to run rapidly when not engaged to a transmission.
- To assign a race to; to perceive as having a (usually specified) race.
- (social studies) Belonging to a certain race of people.
- To demolish; to level to the ground.
- To scrape as if with a razor.