Strong allegiance (7)
I believe the answer is:
loyalty
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">strong 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 loyalty that I've seen before include "Firm allegiance" , "Firmness of allegiance" , "Strong allegiance" , "Faithfully allegiance" , "Fidelity, allegiance" .)