Cave creatures (4)
I believe the answer is:
bats
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">cave creatures</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this in another clue)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for bats that I've seen before include "Crazy; night-fliers" , "Crazy - mammals" , "Those striking" , "Mad - clubs" , "Cricketers" .)