People following rich individual coming in today, moving fast (3,2,9)
I believe the answer is:
day of atonement
'fast' is the definition.
(Yom Kippur, Jewish fast day)
'people following rich individual coming in today moving' is the wordplay.
I cannot quite understand how this works, but
'people' could be 'men' (men can refer to humanity as a whole) and 'men' is located in the answer.
'following' could be 'f' (used when citing page numbers etc) and 'f' is found within the answer.
'individual' could be 'da' (D.A. is an example) and 'da' is located in the answer.
This explanation may well be incorrect...
(Another definition for day of atonement that I've seen is " Yom Kippur".)