Roman emperor or former ruler in outer Turkestan (6)

I believe the answer is:

trajan

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'roman emperor' is the definition.
(I know that Trajan is a roman emperor)

'former ruler in outer turkestan' is the wordplay.
'former ruler' becomes 'raja' (historical term for an Indian king or prince. I am not sure about the 'former' bit.).
'in' indicates putting letters inside.
'outer' suggests removing the centre.
'turkestan' with its centre taken out is 'tn'.
'raja' inserted inside 'tn' is 'TRAJAN'.

'or' is the link.

Can you help me to learn more?

(Other definitions for trajan that I've seen before include "Roman emperor AD ninety eight to AD one hundred and seventeen" , "Roman emperor, ruled 98 to 117 AD" , "Roman emperor of column fame" .)

I've seen this clue in the Evening Standard.

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