Long-eared mammal (4)
I believe the answer is:
hare
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">long-eared mammal</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 hare that I've seen before include "'You can't run with the . . . . and hunt with the hounds'" , "Leveret" , "may be electric!" , "Old saying: 'Let the .... sit" , "Fast runner" .)