Cryptic crossword clue
Empty discharge channel to create dock 6

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

I've seen this crossword clue in The Daily Telegraph
D
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D
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Buddy explains!

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

DEDUCT verb
  1. To take one thing from another; remove from; make smaller by some amount.

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