Followed rules former pupil observed (6)

I believe the answer is:

obeyed

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'followed rules' is the definition.
'obeyed' can be an answer for 'followed' (I've seen this in another clue). I am not certain of the 'rules' bit.

'former pupil observed' is the wordplay.
'former pupil' becomes 'OB' (abbreviation for 'Old Boy' - private school pupil).
'observed' becomes 'eyed' (I've seen this before).
'ob'+'eyed'='OBEYED'

Can you help me to learn more?

(Other definitions for obeyed that I've seen before include "See 8" , "Carried out orders" , "Did what one was told" , "Submitted to an authority" , "Complied with order" .)

I've seen this clue in The Independent.

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