Cryptic crossword clue
Primary requisites for a sewer 6,3,6

The most common and most likely answer to this crossword clue is the 6 plus 3 plus 6 letter word NEEDLE AND THREAD

I've seen this crossword clue in The Guardian
N
E
E
D
L
E
A
N
D
T
H
R
E
A
D

Buddy explains!

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.

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