Stage of development (5)
I believe the answer is:
phase
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">stage of development</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 phase that I've seen before include "Distinct period in development" , "Aspect of moon" , "Passing stage" , "Distinct stage" , "Carry out in stages" .)