Nile queen, informally (4)
I believe the answer is:
cleo
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">nile queen informally</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cleo that I've seen before include "She ruled" , "Dame Laine" , "Carry on -- (1964 film)" , "Woman" , "Jazz singer, ___ Laine" .)