Cryptic crossword clue
Dull pool of water upset 3, American 9

The most common and most likely answer to this crossword clue is the 9 letter word PONDEROUS

I've seen this crossword clue in The Times
P
O
N
D
E
R
O
U
S


Buddy explains!

The straight part
We know that "Dull" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case dull = ponderous.
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 PONDEROUS mean?

PONDEROUS adjective
  1. Heavy, massive, weighty.
  2. (by extension) Serious, onerous, oppressive.
  3. Clumsy, unwieldy, or slow, especially due to weight.
  4. Dull, boring, tedious; long-winded in expression.
  5. Characterized by or associated with pondering.
  6. Dense.

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