The most common and most likely answer to this crossword clue is the 9 letter word STRENGTHS
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Buddy explains!

The straight part
We know that "assets" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case assets = strengths.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 STRENGTHS mean?
STRENGTHS noun- The quality or degree of being strong.
- The intensity of a force or power; potency.
- The strongest part of something; that on which confidence or reliance is based.
- A positive attribute.
- An armed force, a body of troops.
- A strong place; a stronghold.
- To give strength to; to strengthen.