Hold back noise around estimated time of arrival (6)
I believe the answer is:
detain
'hold back' is the definition.
(I've seen this in another clue)
'noise around estimated time of arrival' is the wordplay.
'noise' becomes 'din' (din can mean a loud noise or disturbance).
'around' indicates putting letters inside.
'estimated time of arrival' becomes 'eta' (abbreviation).
'din' going around 'eta' is 'DETAIN'.
(Other definitions for detain that I've seen before include "Confine" , "Sing to (someone)" , "Keep in custody; hold back" , "Take into confinement" , "Keep in custody or delay" .)