Crossword Genius

Murderer chewing over a charge, turning delusional (9)

Ross

I believe the answer is:

paranoiac

I'm a little stuck... Click here to teach me more about this clue!

'delusional' is the definition.
(I've seen this before)

'murderer chewing over a charge turning' is the wordplay.
I cannot quite understand how this works, but
'over' could be 'o' (cricket abbreviation) and 'o' is located in the answer.
'a' could be 'an' and 'an' is present in the answer.
This may be the basis of the clue (or it may be nonsense).

Can you help me to learn more?

(Other definitions for paranoiac that I've seen before include "behaving irrationally" , "Sufferer from desusions of grandeur or persecution" , "Delusional" , "Person suffering from delusions of persecution" .)

I've seen this clue in The Sunday Times.
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