11 across
I
tremble
in
feverish
place
where
the
fuel
runs
out?
(10)
I tremble in feverish place where the fuel runs out? (10)
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The definition is at the end of the clue.
How the clue works
Have a look at place where the fuel runs out? — that's your definition, pointing to the timberline, the altitude above which trees stop growing, so no more wood for fuel. "Feverish" is doing the anagram work here, telling you to shuffle the letters of "I tremble in" to get TIMBERLINE.