Cryptic crossword clue
High-pitched sound under pump regularly increasing 6

The most common and most likely answer to this crossword clue is the 6 letter word UPPING

I've seen this crossword clue in The Daily Telegraph
U
P
P
I
N
G

Buddy explains!

The straight part
We know that "increasing" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case increasing = upping.
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 UPPING mean?

UPPING verb
  1. To increase or raise.
  2. To promote.
  3. (usually in combination with another verb) To act suddenly.
  4. To ascend; to climb up.
  5. To upload.
UPPING noun
  1. The act of increasing something.

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