Republican enemy brought to order by independent (6)
I believe the answer is:
yemeni
'republican' is the definition.
(Yemen is a republic)
'enemy brought to order by independent' is the wordplay.
'brought to order' is an anagram indicator.
'by' means one lot of letters go next to another.
'independent' becomes 'i'.
'enemy' with letters rearranged gives 'yemen'.
'yemen'+'i'='YEMENI'
(Other definitions for yemeni that I've seen before include "Native of a country on the Arabian Peninsula" , "Native of, eg, Aden" , "Someone from Aden?" , "from the Middle East" , "ME citizen" .)