Characters in Odessa edited Review of Theories (5)
I believe the answer is:
ideas
'theories' is the definition.
(I've seen this in another clue)
'characters in odessa edited review' is the wordplay.
'characters in' indicates the answer is hidden within the clue.
'review' shows that the letters should be reversed in order.
'saedi' is hidden within 'odessa edited'.
'saedi' in reverse letter order is 'IDEAS'.
'of' acts as a link.
(Other definitions for ideas that I've seen before include "Thoughts, perceptions" , "Notions, concepts" , "Thoughts, creative perhaps" , "Brainwaves" , "thinking" .)