Nothing odd about order book tycoon presented over part of year (7)
I believe the answer is:
october
'part of year' is the definition.
'nothing odd about order book tycoon presented over' is the wordplay.
'nothing odd about' means one should take alternating letters (letters in odd-numbered positions are removed).
'presented over' is a reversal indicator.
'order'+'book'+'tycoon'='orderbooktycoon'
The alternate letters of 'orderbooktycoon' are 'rebotco'.
'rebotco' written backwards gives 'OCTOBER'.
(Other definitions for october that I've seen before include "The Hunt for Red . . . . . . . (film)" , "Russian Revolution month" , "Month of nineteen seventeen Bolshevik revolution in Russia" , "To be orc (anag)" , "some weeks" .)