Exceptionally large or abundant (6)
I believe the answer is:
bumper
<span class="explanation-format__ClueExplanation">This clue is a double definition.<br/ ><br/ >'<span class="explanation-format__original">exceptionally large</span>' is the first definition.<br/ ><span class="explanation-format__explanation">(I've seen this before)</span><br/ ><br/ >'<span class="explanation-format__original">abundant</span>' is the second definition.<br/ ><span class="explanation-format__explanation">(similar in meaning)</span><br/ ><br/ ></span>
(Other definitions for bumper that I've seen before include "Protective vehicle bar" , "large drink" , "generous amount of alcohol" , "It's a car fender in America" , "Unusually plentiful as a crop may be" .)