Prince reviewed Open with an amateur (8)

I believe the answer is:

maharaja

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'prince' is the definition.
(I know that Maharaja is a type of prince)

'reviewed open with an amateur' is the wordplay.
'reviewed' is a reversal indicator.
'open with' becomes 'ajar' (similar in meaning. I am not sure about the 'with' bit.).
'an' becomes 'a'.
'amateur' becomes 'ham' (as in ham radio).
'ajar'+'a'+'ham'='ajaraham'
'ajaraham' in reverse letter order is 'MAHARAJA'.

Can you help me to learn more?

(Other definitions for maharaja that I've seen before include "Hindu prince" , "Indian prince or king" , "Indian ruler" , "Eminent Indian" , "foreign ruler" .)

I've seen this clue in The Independent.

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