Strict, unforgiving (5)
I believe the answer is:
harsh
<span class="explanation-format__ClueExplanation">I believe this clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">strict</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >'<span class="explanation-format__original">unforgiving</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ ></span>
(Other definitions for harsh that I've seen before include "Punitive" , "Severe - unkind" , "Raucous - austere - bitter" , "Not relenting" , "Rough and disagreeable, maybe of voice" .)