6 down
Gone
wild
with
axes
splitting
something
needed
for
fire
(6)
Gone wild with axes splitting something needed for fire (6)
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The definition is at the end of the clue.
How the clue works
Look at something needed for fire — that's your definition, since oxygen is essential for combustion. "Gone wild" signals an anagram of GONE, giving you OGEN, and then axes does the clever bit: XY (your mathematical axes) splits that anagram to give you O-XY-GEN.