Cryptic crossword clue
Sources of whisper, hushed, in Rolls-Royce? Sound of engine 5

The most common and most likely answer to this crossword clue is the 5 letter word WHIRR

I've seen this crossword clue in The Times
W
H
I
R
R

Buddy explains!

The straight part
We know that "Sound of engine" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case sound of engine = whirr.
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 WHIRR mean?

WHIRR noun
  1. A sibilant buzz or vibration; the sound of something in rapid motion.
  2. A bustle of noise and excitement.
WHIRR verb
  1. To move or vibrate (something) with a buzzing sound.
  2. To make a sibilant buzzing or droning sound.
  3. To cause (something) to make such a sound.

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