Cryptic crossword clue
Lacking gravity, that’s plain 12

The most common and most likely answer to this crossword clue is the 12 letter word UNATTRACTIVE

I've seen this crossword clue in The Guardian
U
N
A
T
T
R
A
C
T
I
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E

Buddy explains!

The straight part
We know that "plain" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case plain = unattractive.
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.

Crossword Answer definitions

UNATTRACTIVE noun
  1. An aesthetically unattractive person
UNATTRACTIVE adjective
  1. Not handsome or beautiful or appealing.
  2. Lacking the power to attract interest.

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