The most common and most likely answer to this crossword clue is the 13 letter word MASS-PRODUCED
I've seen this crossword clue in The Times
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More clues leading to the result MASS-PRODUCED
Buddy explains!

The straight part
We know that "Made many of" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case made many of = mass-produced.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 MASS-PRODUCED mean?
MASS-PRODUCED verb- To manufacture (something) on a large scale, especially by using assembly lines.
- Produced by mass production