Bobby's nonsense about central Siberia (6)

I believe the answer is:

robert

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'bobby's' is the definition.
Both the answer and definition are singular nouns.
Maybe they are linked in a way I don't understand?

'nonsense about central siberia' is the wordplay.
'nonsense' becomes 'rot' (rot can mean nonsense or rubbish).
'about' means one lot of letters goes inside another.
'central' says to take the centre.
The middle of 'siberia' is 'ber'.
'rot' going around 'ber' is 'ROBERT'.

Can you help me to learn more?

(Other definitions for robert that I've seen before include "Name of three Scottish kings" , "- Edward Lee, US Confederate general" , "Victorian premier" , "Butterfly" , "-- Browning, nineteenth century poet" .)

I've seen this clue in the Evening Standard.

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