The most common and most likely answer to this crossword clue is the 10 letter word CONCEIVING
I've seen this crossword clue in The Guardian
C
O
N
C
E
I
V
I
N
G
Buddy explains!
The straight part
We know that "Imagining/making a baby" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case imagining/making a baby = conceiving.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 CONCEIVING mean?
CONCEIVING verb- To develop an idea; to form in the mind; to plan; to devise; to originate.
- To understand (someone).
- To become pregnant (with).
- Conception.