Coolness under pressure (5)
I believe the answer is:
poise
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">coolness under pressure</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 poise that I've seen before include "Sang-froid" , "Grace; equilibrium" , "Dignity; equilibrium" , "Balance; composure" , "Coolness and composure under strain" .)