10 across
Rafter
collapsing
around
one
–
start
to
panic
in
dangerous
building
(8)
Rafter collapsing around one – start to panic in dangerous building (8)
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The definition is at the end of the clue.
How the clue works
Look at dangerous building at the end — that's your definition. Take rafter collapsing as an anagram of RAFTER, then wrap it around one (that's I) to give you FIRETRA, and finally stick on start to panic — just the first letter, P — at the end.