Ex-chancellor attached to following rules (6)

I believe the answer is:

lawson

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

'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' says to put letters next to each other.
'rules' becomes 'laws' (laws are rules).
'on' put 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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