Wedge (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wedge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for jam that I've seen before include "Sweet stuff for bread - stuff it in" , "Fruit preserve" , "Block signals" , "awful traffic" , "Spread; improvise (jazz)" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">wedge</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that shim is a type of wedge)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for shim that I've seen before include "Thin spacer" , "Thin strip of metal" , "sort of rod used in reactors" , "Slip" .)