See shiner among Democrats go dangerously leftward (3,4)
I believe the answer is:
dog star
'see shiner' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.
'among democrats go dangerously leftward' is the wordplay.
'among' indicates a hidden word.
'leftward' says the letters should be written backwards (from left to right).
'ratsgod' can be found hidden inside 'democrats go dangerously'.
'ratsgod' written backwards gives 'DOG-STAR'.
(Other definitions for dog star that I've seen before include "slightly flashy night-spot?" , "Lassie, perhaps" , "What may not be seen on cloudy night" , "Sirius may also be arts god" , "Part of 8 [CANIS MAJOR]" .)