Gnawing mammals (7)
I believe the answer is:
rodents
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">gnawing mammals</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 rodents that I've seen before include "Eg, mice" , "Mice, squirrels etc" , "Animals that gnaw" , "Rats, mice, hamsters" , "Rats and mice, say" .)