Initially, Ronald Reagan represented order (7)
I believe the answer is:
arrange
'order' is the definition.
(synonyms)
'initially ronald reagan represented' is the wordplay.
'initially' suggests taking the first letters.
'represented' is an anagram indicator.
The initial letter of 'ronald' is 'r'.
'r'+'reagan'='rreagan'
'rreagan' is an anagram of 'ARRANGE'.
(Other definitions for arrange that I've seen before include "Set in order" , "Put into a proper order" , "Put in systematic order" , "position" , "Put in order; make plans" .)