Diversion (9)
'diversion' is the definition.
(I've seen this before)
This is all the clue.
(Other definitions for detour that I've seen before include "Deviation from usual course" , "Deviation from direct course" , "Circuitous alternative to direct path" , "A way around or deviation from intended route" , "The scenic route?" .)
'diversion' is the definition.
(I know that amusement is a type of diversion)
This is the entire clue.
(Other definitions for amusement that I've seen before include "Light-hearted pastime" , "Pleasure, diversion" , "Pleasant diversion by mute means (9)" , "Something which entertains" , "Idle wasting of time" .)