Twelve dozen glaring (5)
I believe the answer is:
gross
I believe this is a double definition.
'twelve dozen' is the first definition.
(I've seen this before)
'glaring' is the second definition.
(synonyms)
(Other definitions for gross that I've seen before include "exclamation of disgust" , "Twelve dozen" , "Coarse and crude" , "Coarse; repulsive" , "Horribly large" .)