Torrent of water from river covering lounge, oddly (6)
I believe the answer is:
deluge
'torrent of water' is the definition.
(deluge can mean flood)
'river covering lounge oddly' is the wordplay.
'river' becomes 'Dee' (River Dee).
'covering' indicates putting letters inside.
'oddly' means one should take alternating letters (letters in the odd-numbered positions are used).
The alternating letters of 'lounge' are 'lug'.
'dee' enclosing 'lug' is 'DELUGE'.
'from' is the link.
(Other definitions for deluge that I've seen before include "Swamp" , "A heavy fall of rain (6)" , "Flooding downpour" , "Major flood" , "Cloudburst, downpour" .)