Our pile’s wobbly, threatening (8)
I believe the answer is:
perilous
'threatening' is the definition.
(thesaurus)
'our pile's wobbly' is the wordplay.
'wobbly' indicates anagramming the letters.
'our'+'piles'='ourpiles'
'ourpiles' is an anagram of 'PERILOUS'.
(Other definitions for perilous that I've seen before include "Fraught with danger" , "Risky" , "promising danger" , "Extremely dangerous" , "Full of danger" .)