Living dangerously, I hint about bungs in the past (2,4,3)
I believe the answer is:
on thin ice
'living dangerously' is the definition.
(someone said to be on thin ice is in danger)
'i hint about bungs in the past' is the wordplay.
'about' indicates anagramming the letters.
'bungs' means one lot of letters goes inside another (to bung can mean to seal or plug a gap).
'in the past' becomes 'once' (I've seen this before).
'i'+'hint'='ihint'
'ihint' with letters rearranged gives 'thini'.
'thini' going inside 'once' is 'ON THIN ICE'.
(Other definitions for on thin ice that I've seen before include "At risk" , "In perilous situation - don't skate thus (2,4,3)" , "like a daredevil skater?" , "in danger of a soaking?" , "sailing close to the wind?" .)