Crossword Genius

Run loud and deep (4)

Ross

I believe the answer is:

flow

'run' is the definition.
(synonyms)

'loud and deep' is the wordplay.
'loud' becomes 'f' (short for forte - 'loud' in music).
'and' is a charade indicator (letters next to each other).
'deep' becomes 'low' (similar in meaning).
'f'+'low'='FLOW'

(Other definitions for flow that I've seen before include "Run smoothly" , "Wolf (anag.)" , "Run or move like a liquid" , "(Forward) movement of liquid" , "Fluid motion" .)

I've seen this clue in The Globe and Mail.
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