Republican appears regularly to visit pair of Americans, those seizing power (8)
I believe the answer is:
usurpers
'those seizing power' is the definition.
(people who usurp)
'republican appears regularly to visit pair of americans' is the wordplay.
'republican' becomes 'r' (abbreviation).
'regularly' indicates alternate letters (regularly take one letter, leave next etc.).
'to visit' indicates putting letters inside.
'pair' says to double the letters.
'of americans' becomes 'us' (I am not sure about this - if you are sure you should believe this answer much more).
The alternating letters of 'appears' are 'per'.
'r'+'per'='rper'
'us' duplicated is 'usus'.
'rper' going inside 'usus' is 'USURPERS'.
Can you help me to learn more?
(Other definitions for usurpers that I've seen before include "making pretence a reality" , "They assume power illegally" , "Pursuers of those who wrongfully take positions of others" , "Pursuers after those who take office wrongfully" , "Pursuers of wrongful occupiers" .)