Steadfast in allegiance (5)
I believe the answer is:
loyal
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">steadfast in allegiance</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for loyal that I've seen before include "True-hearted" , "Dependable" , "Faithful (in allegiance)" , "Keeping faith" , "True to one's country etc" .)