Managed time in riotous depot (8)
I believe the answer is:
operated
'managed' is the definition.
(I've seen this in another clue)
'time in riotous depot' is the wordplay.
'time' becomes 'era' (era is a kind of time).
'in' indicates putting letters inside.
'riotous' indicates an anagram.
'depot' is an anagram of 'opted'.
'era' inserted inside 'opted' is 'OPERATED'.
(Other definitions for operated that I've seen before include "'Directed or controlled, machinery say (8)'" , "Adore pet (anag.)" , "Functioned" , "Performed surgery or worked a machine" , "ran" .)