Anti-Congress, like one Republican force from the right (6)
I believe the answer is:
frigid
'anti-congress' is the definition.
I can't tell whether this defines the answer.
'like one republican force from the right' is the wordplay.
'like' becomes 'dig' (I've seen this in another clue).
'one' becomes 'i' (Roman numeral).
'republican' becomes 'R' (abbreviation).
'force' becomes 'f' (symbol used in Physics e.g. f=ma).
'from the right' says the letters should be written backwards.
'dig'+'i'+'r'+'f'='digirf'
'digirf' back-to-front is 'FRIGID'.
Can you help me to learn more?
(Other definitions for frigid that I've seen before include "Very cold in manner" , "far from warm" , "Frozen" , "Lacking affection or warmth" , "Stiff - cold - formal" .)