The most common and most likely answer to this crossword clue is the 12 letter word INTRODUCTION
I've seen this crossword clue in The Daily Telegraph
I
N
T
R
O
D
U
C
T
I
O
N
More clues leading to the result INTRODUCTION
- Doctor in unit reassembled for formal presentation
- Induction split: possibly rot set in at the launch
- Present reduction all over the shop
- Elementary text, something famous person doesn’t need
- Doctor in unit performing birth
- Opening batting, tense except for power play
- Start telling son to avoid catching colds regularly
Buddy explains!
The straight part
We know that "birth" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case birth = introduction.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 INTRODUCTION mean?
INTRODUCTION noun- The act or process of introducing.
- A means, such as a personal letter, of presenting one person to another.
- An initial section of a book or article, which introduces the subject material.
- A written or oral explanation of what constitutes the basis of an issue.