Swift feline (7)
I believe the answer is:
cheetah
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">swift feline</span>' is the definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >This is all the clue.<br/ ></span>
(Other definitions for cheetah that I've seen before include "Swift predator" , "Fastest cat" , "Fast spotted wildcat - sounds dishonest" , "Swift African cat" , "Spotted creature" .)