Cryptic crossword clue
Sewer’s storage facility regularly tests unit 4

The most common and most likely answer to this crossword clue is the 4 letter word ETUI

I've seen this crossword clue in Independent
E
T
U
I


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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 ETUI mean?

ETUI noun
  1. A small, ornamental bag or rigid container used for holding articles such as needles.

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