Cryptic crossword clue
Often upset, ignoring constant mechanical noise 3

The most common and most likely answer to this crossword clue is the 3 letter word HUM

H
U
M

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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 HUM mean?

HUM interjection
  1. Indicating thinking or pondering.
  2. A demand for an answer to a question.
HUM noun
  1. A hummed tune, i.e. created orally with lips closed.
  2. An often indistinct sound resembling human humming.
  3. Busy activity, like the buzz of a beehive.
  4. Unpleasant odour.
  5. An imposition or hoax; humbug.
  6. A kind of strong drink.
  7. A phenomenon, or collection of phenomena, involving widespread reports of a persistent and invasive low-frequency humming, rumbling, or droning noise not audible to all people.
HUM verb
  1. To make a sound from the vocal chords without pronouncing any real words, with one's lips closed.
  2. To express by humming.
  3. To drone like certain insects naturally do in motion, or sounding similarly
  4. To buzz, be busily active like a beehive
  5. To produce low sounds which blend continuously
  6. To reek, smell bad.
  7. To flatter by approving; to cajole; to deceive or impose upon; to humbug.
HUM interjection
  1. An expression used to show contentment for something
  2. An expression used to show thought or reflection
  3. An expression used to show being muffled or not able to speak clearly, as well as "mmph".
  4. Yes.
HUM interjection
  1. Expression of hesitation, uncertainty or space filler in conversation. See uh.

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