Cryptic crossword clue
They transport waste from say, your dirty street, mostly 7

The most common and most likely answer to this crossword clue is the 7 letter word URETERS

U
R
E
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E
R
S

Buddy explains!

The straight part
We know that "They transport waste" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case they transport waste = ureters.
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 URETERS mean?

URETERS noun
  1. Either of the two long, narrow ducts that carry urine from the kidneys to the urinary bladder.

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