Ex-chancellor attached to following rules (6)

I believe the answer is:

lawson

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'ex-chancellor' is the definition.
I can't judge whether this definition defines the answer.

'attached to following rules' is the wordplay.
'attached' becomes 'on' (I've seen this in other clues).
'to following' means one lot of letters go next to another.
'rules' becomes 'laws' (laws are rules).
'on' after 'laws' is 'LAWSON'.

Can you help me to learn more?

(Another definition for lawson that I've seen is " See 6".)

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