Petal (4)
I believe the answer is:
leaf
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">petal</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 leaf that I've seen before include "Two pages of a book" , "Bit of foliage" , "Frond" , "Organ of photosynthesis in plants" , "Part of tree or book" .)