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

The straight part
We know that "tending to be different" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case tending to be different = divergent.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 DIVERGENT mean?
DIVERGENT adjective- Growing further apart; diverging.
- Of a series, not converging; not approaching a limit.
- Disagreeing from something given; differing.
- Causing divergence of rays.