Minder gets score altered on time (6)
I believe the answer is:
'minder' is the definition.
'score altered on time' is the wordplay.
'altered' indicates an anagram.
'on' means one lot of letters go next to another.
'time' becomes 't' (abbreviation).
'score' anagrammed gives 'escor'.
'gets' acts as a link.
(Other definitions for escort that I've seen before include "Provide company - car - guard" , "Entourage" , "Companion in corset, perhaps military" , "One who accompanies another" , "guide" .)