Regular and predictable movement late in the day (8)
I believe the answer is:
eventide
'late in the day' is the definition.
(I've seen this before)
'regular and predictable movement' is the wordplay.
'regular' becomes 'even' (similar in meaning).
'and' says to put letters next to each other.
'predictable movement' becomes 'tide' (I have seen 'Movement of seawater ' mean 'tide' so perhaps 'movement' could also mean 'tide'. I am not sure about the 'predictable' bit.).
'even'+'tide'='EVENTIDE'
Can you help me to learn more?
(Other definitions for eventide that I've seen before include "The day's close (poetic)" , "late in the day?" , "latter part of the day" , "some time later?" , "onset of dusk" .)