Cryptic crossword clue
Fuel is in jars with boron that's not easily melted 9

The most common and most likely answer to this crossword clue is the 9 letter word INFUSIBLE

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Buddy explains!

The straight part
We know that "not easily melted" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case not easily melted = infusible.
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 INFUSIBLE mean?

INFUSIBLE adjective
  1. That cannot be fused; unmeltable.
INFUSIBLE adjective
  1. Capable of being infused.
  2. From which an infusion may be made.

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