Cryptic crossword clue
One-time citizen’s infant boy consuming half of capital 10

The most common and most likely answer to this crossword clue is the 10 letter word BABYLONIAN

I've seen this crossword clue in The Times
B
A
B
Y
L
O
N
I
A
N

Buddy explains!

The straight part
We know that "One-time citizen" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case one-time citizen = babylonian.
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.

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