Common allergen (3)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">common allergen</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 pollen that I've seen before include "Frequent cause of allergies" , "Fine powder produced by the anthers of seed-bearing plants" , "Airborne 10 across" , "Powder from flowers" , "Fertilising grains" .)
(Other definitions for nut that I've seen before include "Enthusiastic person" , "Hard shell of a locking device" , "eg Pecan" , "Fanatic (slang)" , "Hard fruit or informal lunatic" .)