Different order that has evidently reversed, first of all (5)
I believe the answer is:
other
'different' is the definition.
(similar in meaning)
'order that has evidently reversed first of all' is the wordplay.
'first of all' indicates taking the first letters.
The first letters of 'order that has evidently reversed' is 'OTHER'.
(Other definitions for other that I've seen before include "Different, not the same one or this one" , "One may be significant" , "Different (from those mentioned)" , "Alternative - unrelated" , "Throe (anag)" .)