Cryptic crossword clue
Uranium in test room moved nearest the edge 9

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

O
U
T
E
R
M
O
S
T

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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 OUTERMOST mean?

OUTERMOST adjective
  1. Outside; external.
  2. Farther from the centre of the inside.
OUTERMOST noun
  1. That which is outermost; the surface; the outside.

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