Old boy looked at and followed (6)
I believe the answer is:
obeyed
'followed' is the definition.
(I've seen this in another clue)
'old boy looked at' is the wordplay.
'old boy' becomes 'OB' (abbreviation for a private school 'old boy').
'looked at' becomes 'eyed' (I've seen this before).
'ob'+'eyed'='OBEYED'
'and' acts as a link.
(Other definitions for obeyed that I've seen before include "Compiled, followed order" , "See 14" , "Compiled with directive" , "Followed the rules" , "Complied with command" .)