Gold found in river, a fast flowing one (7)
I believe the answer is:
torrent
'a fast flowing one' is the definition.
Although both the answer and definition are singular nouns, I can't understand how they can define each other.
'gold found in river' is the wordplay.
'gold' becomes 'or' ('or' is the heraldic name for gold).
'found in' indicates putting letters inside.
'river' becomes 'trent' (River Trent).
'or' going inside 'trent' is 'TORRENT'.
Can you help me to learn more?
(Other definitions for torrent that I've seen before include "Rushing stream, flood" , "Rush of water" , "Heavy flow of water" , "fast-moving flow" , "Overwhelming outpouring" .)