The most common and most likely answer to this crossword clue is the 8 letter word KINDLING
I've seen this crossword clue in The Daily Telegraph
K
I
N
D
L
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G
More clues leading to the result KINDLING
Buddy explains!
The straight part
We know that "that will catch fire easily" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case that will catch fire easily = kindling.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 KINDLING mean?
KINDLING verb- To start (a fire) or light (a torch, a match, coals, etc.).
- To arouse or inspire (a passion, etc).
- To begin to grow or take hold.
- (of a rabbit or hare) To bring forth young; to give birth.
- Small pieces of wood and twigs used to start a fire.
- The act by which something is kindled.