Betting adviser (7)
I believe the answer is:
tipster
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">betting adviser</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tipster that I've seen before include "One giving better advice" , "Person who points out likely race winners" , "he recommends risky investments" , "One predicting winners" , "One who sells betting advice" .)