The most common and most likely answer to this crossword clue is the 9 letter word EARLINESS
I've seen this crossword clue in The Guardian
E
A
R
L
I
N
E
S
S
More clues leading to the result EARLINESS
- With inexperienced cast I found inarticulate
- Condition of premature baby: wrinkles between sides of head
- Queues stopping organs arriving ahead of schedule
- Basis of health, wealth and wisdom one’s seen in noble head
- Wear lines somewhat showing prematurity
- Not being tardy is nobleman having basically intelligent head
Buddy explains!
The straight part
We know that "Condition of premature baby" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case condition of premature baby = earliness.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.