Padre, with joy, reformed menace (8)
I believe the answer is:
jeopardy
'menace' is the definition.
(thesaurus)
'padre with joy reformed' is the wordplay.
'with' means one lot of letters go next to another.
'reformed' is an anagram indicator.
'padre'+'joy'='padrejoy'
'padrejoy' anagrammed gives 'JEOPARDY'.
(Other definitions for jeopardy that I've seen before include "Danger of harm" , "Hazard, risk" , "Peril. danger" , "Personal danger" , "Danger of injury, loss, death, etc" .)