Stone (6)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that pebble is a type of stone)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pebble that I've seen before include "'Small, rounded stone (6)'" , "Stone on beach" , "There are many on a stony beach" , "Little rock" , "one of many on beach" .)
(Other definitions for rock that I've seen before include "Swing" , "Seaside confectionery" , "Sweet < music" , "wobble" , "Lull (baby); 50s pop" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(gemstone)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for opal that I've seen before include "Semi-precious stone of milky or bluish colour" , "Many-coloured gem" , "Gem with delicate colours" , "Precious stone" , "Lustrous stone" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stone</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I know that stone can be written as pit)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for pit that I've seen before include "Where the orchestra sits to accompany performers" , "Tip into hole" , "Portland stone" , "A hole as for coal" , "Mine; fruit-stone" .)