Beer drained by Republicans – it's bitter! (4)
I believe the answer is:
brrr
'bitter' is the definition.
I know nothing about this answer so I cannot tell whether it can be defined by this definition.
'beer drained by republicans' is the wordplay.
'drained' means to remove the middle letters.
'by' is a charade indicator (letters next to each other).
'republicans' becomes 'rr' (political abbreviation for republican repeated).
'beer' with its centre removed is 'br'.
'br'+'rr'='BRRR'
'it's' is the link.
Can you help me to learn more?
(Other definitions for brrr that I've seen before include "How freezing" , "Cold person's exclamation" , "I'm definitely not hot" , "Complaint about cold" , "Indication of iciness" .)