Possible Clues:

• Bass player?
• Corner at head of river for him?
• Fisherman of sorts
• Fury about lake -- when it lacks fish for him?
• One has inclination to be by river?
• He drops a line hoping for some response
• For more of a degree, see 11, 17 and 23 down
• This one might make one fishy to a certain degree (6)
• Isaac Walton wrote of the 'Compleat' one
• Fisher with hook and line.