Cycle part (5)
I believe the answer is:
phase
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cycle part</span>' is the definition.<br/ ><span class="explanation-format__explanation">('phase' is part of 'cycle')</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for phase that I've seen before include "Period or stage in a process of change" , "Period within process" , "Distinct period in development" , "Shape into stage" , "Truman -, US novelist" .)