Bodily catalyst (6)
I believe the answer is:
enzyme
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bodily catalyst</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for enzyme that I've seen before include "Catalyst made of protein" , "E.g. pepsin" , "Catalytic protein substance" , "It acts as a catalyst to bring about biochemical reaction" , "Substance produced by living cells" .)