Instant deliveries before late hours (9)
I believe the answer is:
overnight
'instant' is the definition.
(thesaurus)
'deliveries before late hours' is the wordplay.
'deliveries' becomes 'over' (a cricket over consists of six deliveries).
'before' says to put letters next to each other.
'late hours' becomes 'night' (I have seen 'Hours of darkness' mean 'night' so perhaps 'hours' could also mean 'night'. I am not sure about the 'late' bit.).
'over'+'night'='OVERNIGHT'
Can you help me to learn more?
(Other definitions for overnight that I've seen before include "Until morning; suddenly" , "until tomorrow" , "Very quickly" , "Lightning" , "Lasting from dusk to dawn" .)