Possible Clues:

• Singled out item of angling equipment in which I caught fish
• Potentially shocking slippery customer
• A diver may find it shocking
• One that creates a current in the current
• Choose basis of paella article for Spanish shocker
• Long fish
• Shocking fish?
• It swims with the current
• Fish which might give you a shock
• It may give us a shock, swimming in S America