clue stick
A metaphorical stick used to beat information or understanding into a slow learner.
Leadbetter needs to be thwacked with a legal clue stick. The law he's talking about applies only to Internet service providers, not reporters.
ADJ
good, important, useful, valuable | vital | tell-tale | obvious
VERB + CLUE
have, hold
Scientists believe that studying ocean temperatures may hold the clue to understanding future weather patterns.
give (sb), furnish/provide/supply (sb with), yield
The detective's notebook provided crucial clues about what happened that night.
hunt for, look for, search for | discover, find, uncover
leave
The mysterious disappearance left the police with almost no clues to follow.
follow (up)
PREP
~ about
The detective found a vital clue about the missing jewels during the investigation.
~ (as) to
The detective found an important clue to the identity of the mysterious stranger.