Cryptic crossword clue
Congested excavation channel turned over

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

I've seen this crossword clue in The Guardian
T
U
R
G
I
D

Buddy explains!

The straight part
We know that "Congested" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case congested = turgid.
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 TURGID mean?

TURGID adjective
  1. Distended beyond the natural state by some internal agent, especially fluid, or expansive force.
  2. (of language or style) Overly complex and difficult to understand; grandiloquent; bombastic.

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