Servile types principally seen in Arabian republic (3,3)
I believe the answer is:
yes men
'servile types' is the definition.
I know nothing about this answer so I cannot judge whether it can be defined by this definition.
'principally seen in arabian republic' is the wordplay.
'principally' suggests taking the first letters.
'in' indicates putting letters inside.
'arabian republic' becomes 'yemen' (I've seen this in another clue).
The first letter of 'seen' is 's'.
's' inserted inside 'yemen' is 'YES-MEN'.
Can you help me to learn more?
(Other definitions for yes men that I've seen before include "Unquestioning followers" , "Servile subordinates" , "Tools" , "Sycophants like assenting males" , "Affirmative male sycophants" .)