New rate then put at risk (8)
I believe the answer is:
threaten
'put at risk' is the definition.
(I've seen this before)
'new rate then' is the wordplay.
'new' indicates anagramming the letters.
'rate'+'then'='ratethen'
'ratethen' is an anagram of 'THREATEN'.
(Other definitions for threaten that I've seen before include "Menace - impend" , "Warn of violence" , "Impend, portend" , "Give warning of something unpleasant" , "'Menace, intimidate (8)'" .)