Egotistical Republican leaders must be pushed into river by a Brownie? (6)
I believe the answer is:
camera
'brownie?' is the definition.
(I've seen this before)
'egotistical republican leaders must be pushed into river by a' is the wordplay.
'leaders' suggests taking the first letters.
'must be pushed into' means one lot of letters goes inside another.
'river' becomes 'cam' (river in Cambridge, England).
'by' means one lot of letters go next to another.
The initial letters of 'egotistical republican' is 'er'.
'cam'+'a'='cama'
'er' going inside 'cama' is 'CAMERA'.
(Other definitions for camera that I've seen before include "one that produces pictures" , "A court held in it is not open to the public" , "Optical recorder" , "Photographer's apparatus" , "source of shots?" .)