In Vietnam, on golden bridge (5)
I believe the answer is:
among
'bridge' is the definition.
I don't know anything about this answer so I can't judge whether it can be defined by this definition.
'in vietnam on golden' is the wordplay.
'in' indicates a hidden word.
'AMONG' can be found hidden inside 'vietnam on golden'.
Can you help me to learn more?
(Other definitions for among that I've seen before include "In the midst of (others)" , "Amid" , "In an assembly of" , "Go man! (anag.)" , "Together with" .)