Neo had it backwards, concealing ID (5)
I believe the answer is:
idaho
'id' is the definition.
Although both the answer and definition are singular nouns, I can't understand how one could define the other.
'neo had it backwards concealing' is the wordplay.
'concealing' indicates the answer is hidden within the clue.
'backwards' says the letters should be written backwards.
'ohadi' is hidden within 'neo had it'.
'ohadi' in reverse letter order is 'IDAHO'.
Can you help me to learn more?
(Other definitions for idaho that I've seen before include "part of US near Washington" , "State of north-west USA" , "Northern US state" , "The Gem State, known for its potatoes" , "One of 22 Across, capital Boise" .)