Stop temper in place at risk (8)
I believe the answer is:
endanger
'place at risk' is the definition.
(I've seen this in another clue)
'stop temper' is the wordplay.
'stop' becomes 'end' (synonyms).
'temper' becomes 'anger'.
'end'+'anger'='ENDANGER'
'in' is the link.
(Other definitions for endanger that I've seen before include "Jeopardize" , "Threaten" , "Expose to injury or extinction" , "Put in jeopardy" , "Place into peril, jeopardise" .)