Cryptic crossword clue
Incomer by ground that has yet to be developed 9

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

I've seen this crossword clue in The Guardian
E
M
B
R
Y
O
N
I
C

Buddy explains!

The straight part
We know that "that has yet to be developed" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that has yet to be developed = embryonic.
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 EMBRYONIC mean?

EMBRYONIC adjective
  1. Of or relating to an embryo.
  2. Of a project, etc: very new and still evolving; yet to reach its full potential.

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