Gold in bulk leads to dangerous situation (6)
I believe the answer is:
morass
'dangerous situation' is the definition.
(I've seen this before)
'gold in bulk' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'in' is an insertion indicator.
'bulk' becomes 'mass' (synonyms).
'or' placed into 'mass' is 'MORASS'.
'leads to' acts as a link.
(Other definitions for morass that I've seen before include "complicated situation" , "Confusion" , "Bog; confused situation" , "Bog - situation hard to get out of" , "Bog or marsh" .)