Regular revolutionary beat Reagan (6)
I believe the answer is:
normal
'regular' is the definition.
(synonyms)
'revolutionary beat reagan' is the wordplay.
'revolutionary' shows that the letters should be reversed in order (letters revolve around).
'beat' becomes 'lam' (I've seen this before).
'reagan' becomes 'ron' (I've seen this in another clue).
'lam'+'ron'='lamron'
'lamron' back-to-front is 'NORMAL'.
(Other definitions for normal that I've seen before include "Average or ordinary" , "Conforming to what is usual" , "Usual, not extraordinary" , "Usual - sane" , "Customary" .)