Eg, pipistrelle (3)
I believe the answer is:
bat
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">eg pipistrelle</span>' is the definition.<br/ ><span class="explanation-format__explanation">(pipistrelle is a kind of bat)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for bat that I've seen before include "A mammal; a club" , "Cricketer; mammal" , "Night-flyer" , "Small flying mammal - like 11 Across" , "Nocturnal flier" .)