Justification for one's actions after the event (15)
I believe the answer is:
rationalisation
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">justification for one's actions after the event</span>' is the definition.<br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for rationalisation that I've seen before include "The application of reason" , "Dubious attempt to explain" , "explanation" .)