Flake out to see lot wrong among Republicans (2,2,5)
I believe the answer is:
go to sleep
'flake out' is the definition.
(synonyms)
'see lot wrong among republicans' is the wordplay.
'wrong' indicates anagramming the letters.
'among' means one lot of letters goes inside another (inserted letters are placed among others).
'republicans' becomes 'gop' (the Grand Old Party, nickname for US Republicans).
'see'+'lot'='seelot'
'seelot' is an anagram of 'toslee'.
'toslee' put inside 'gop' is 'GO TO SLEEP'.
'to' is the link.
(Other definitions for go to sleep that I've seen before include "Lose consciousness" , "Drop off" .)