Republican worker's intemperate speech (4)
I believe the answer is:
rant
'intemperate speech' is the definition.
(I've seen this before)
'republican worker's' is the wordplay.
'republican' becomes 'r' (abbreviation).
'worker' becomes 'ant' (worker is a type of ant).
'r'+'ant'='RANT'
(Other definitions for rant that I've seen before include "Angry tirade" , "Angry outburst" , "Bombastically declaim" , "Loud and emotional declamation" , "Talk wildly and incoherently" .)