The most common and most likely answer to this crossword clue is the 9 letter word EXEMPLIFY
I've seen this crossword clue in The Times
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More clues leading to the result EXEMPLIFY
Buddy explains!

The straight part
We know that "Be typical of" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case be typical of = exemplify.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 EXEMPLIFY mean?
EXEMPLIFY verb- To show or illustrate by example.
- To be an instance of or serve as an example.
- To make an attested copy or transcript of (a document) under seal.
- To prove by such an attested copy or transcript.