The phrase "clear signal" means receiving a communication or message that is easily understood and without any confusion or interference. Full definition
Such national targets send clear signals to the market that the government is committed to this new low - carbon industry for the long haul, thus stimulating private and provincial investment. (greenleapforward.com)
Still, this is not an all - clear signal for ocean acidification. (oceanacidification.de)
My 10 month old gives clear signals when she needs to poop, but I haven't tried putting her on the potty yet. (greenbabyguide.com)