Guide for watch started admin when distracted (8,4)
I believe the answer is:
'guide for watch' is the definition.
(standard for clocks)
'started admin when distracted' is the wordplay.
'when distracted' indicates anagramming the letters.
'startedadmin' is an anagram of 'STANDARD TIME'.
(Another definition for standard time that I've seen is " What passes locally".)