Scottish cap (3)
I believe the answer is:
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">scottish cap</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tam that I've seen before include "Ratings compiled on TV listener numbers" , "TV audience ratings" , "...-o'-shanter, Scottish cap" , "Turn over the mat for a cap" , "'Scottish cloth cap, in short (3)'" .)