Unvarying, consistent (7)
I believe the answer is:
uniform
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">unvarying</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ >'<span class="explanation-format__original">consistent</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(synonyms)</span><br/ ><br/ ></span>
(Other definitions for uniform that I've seen before include "Regular - formal dress" , "Regimentals" , "Regular sort of formal outfit" , "Military clothing" , "Alike all over" .)