Related Clues:

• Is there any suggestion that one might use a pen on the fish?
• Over fish, an indication to write-up
• Is there any suggestion that one might use it to write to the fish?
• Is there any indication that one might write something so fishy?
• Write to the fish? What a suggestion
• Suspicion it's defence for squid and fish
• One not known to Heather provides a hint
• Vague idea
• Vague suspicion
• Faint notion
• Slightest idea
• Hint suggested using one's pen to go over pencil, finally
• Glimmering of notion
• Hint of dark fluid found on heather
• Vague notion