Rascal caught in narrow channel on lake (9)
I believe the answer is:
scoundrel
'rascal' is the definition.
(I've seen this before)
'caught in narrow channel on lake' is the wordplay.
'caught' becomes 'c' (cricket abbreviation).
'in' indicates putting letters inside.
'narrow channel' becomes 'sound' (I've seen this before).
'on lake' becomes 'rel' (I can't explain this - if you can you should give a lot more credence to this answer).
'c' going into 'sound' is 'scound'.
'scound'+'rel'='SCOUNDREL'
(Other definitions for scoundrel that I've seen before include "Villain" , "Rascal" , "Cad" , "Red consul may be a rogue" , "Unprincipled rogue" .)