Notices about Republican prophets (5)
I believe the answer is:
seers
'prophets' is the definition.
(both can mean people who see the future)
'notices about republican' is the wordplay.
'notices' becomes 'sees' (to notice is to observe or see).
'about' means one lot of letters goes inside another.
'republican' becomes 'R' (abbreviation in US politics).
'sees' placed around 'r' is 'SEERS'.
(Other definitions for seers that I've seen before include "wise men" , "They have visions of the future" , "Prophets" , "Visionaries" , "They divine the future" .)