Bird’s bill (4)
I believe the answer is:
beak
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">bird's bill</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 beak that I've seen before include "Bird's bill" , "Bill; nose" , "Schoolmarm" , "Horny mouth of a bird" , "Nose (slang)" .)