Cryptic crossword clue
Public regiment about to accept external cover-up? 9

The most common and most likely answer to this crossword clue is the 9 letter word OUTERWEAR

O
U
T
E
R
W
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A
R


Buddy explains!

The straight part
We know that "external cover-up" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case external cover-up = outerwear.
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 OUTERWEAR mean?

OUTERWEAR noun
  1. Clothing (such as a dress) worn over one's underwear
  2. Clothing (such as a rain jacket) worn over one's clothes when outdoors

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