Sudden surge by scoundrel breaking cover (7)
I believe the answer is:
cascade
'sudden surge' is the definition.
The answer and definition can be both to do with motion as well as being verbs in their base form.
Perhaps you can see an association between them that I can't see?
'scoundrel breaking cover' is the wordplay.
I cannot quite understand how this works, but
'scoundrel' could be 'cad' (cad is a kind of scoundrel) and 'cad' is found in the answer.
'cover' could be 'case' (case is a kind of cover) and 'case' is found in the leftover letters.
This accounts for all the letters.
This may be the basis of the clue (or it may be nonsense).
'by' is the link.
Can you help me to learn more?
(Other definitions for cascade that I've seen before include "Series of small waterfalls" , "Rush" , "Sudden downpour" , "falls in the river" , "Torrent" .)