The most common and most likely answer to this crossword clue is the 7 letter word TORRENT
I've seen this crossword clue in The Guardian
T
O
R
R
E
N
T
More clues leading to the result TORRENT
- Downpour: worry, missing outsiders, in shelter
- Up-for-lease houses close to clear stream
- Flood from river covering moor regularly
- Rapid flow in stream or in major river
- Fast stream from gash on hill
- Increased current cost of Glastonbury venue?
- Huge flow of gold found in British river
- Rush to let out grasping Republican
- Hill torn apart in deluge
- Right plugs for hire in deluge
Buddy explains!

The straight part
We know that "Huge flow" is the straight/definition part of the clue. The straight part is often a synonym or definition, in this case huge flow = torrent.The cryptic/wordplay part
In cryptic crossword there's often an wordplay/cryptic part as well.This part involves a more complex hint, such as an anagram, homophone, hidden word, etc.
Sadly, We don't have an explanation for this specific crossword clue yet.
What does TORRENT mean?
TORRENT noun- A violent flow, as of water, lava, etc.; a stream suddenly raised and running rapidly, as down a precipice.
- A large amount or stream of something.
- Rolling or rushing in a rapid stream.
- (file sharing) A set of files obtainable through a peer-to-peer network, especially BitTorrent.
- To download in a torrent.