Minor to be ordered to supervise (7)
I believe the answer is:
monitor
'to supervise' is the definition.
(synonyms)
'minor to be ordered' is the wordplay.
'be ordered' indicates an anagram.
'minor'+'to'='minorto'
'minorto' with letters rearranged gives 'MONITOR'.
(Other definitions for monitor that I've seen before include "Prefect; a loudspeaker" , "Keep under surveillance" , "Person or device for observing and checking" , "Sort of lizard" , "Police" .)