Shape, pattern (5)
I believe the answer is:
mould
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">shape</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I know that mould is a kind of shape)</span><br/ ><br/ >'<span class="explanation-format__original">pattern</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(thesaurus)</span><br/ ><br/ ></span>
(Other definitions for mould that I've seen before include "Must" , "Furry fungus" , "Guide or control the development of" , "Pattern for shaping - fungoid growth" , "Fungal growth; template" .)