Tins arranged by worker without delay (7)
I believe the answer is:
instant
'without delay' is the definition.
(instant means at once or without delay)
'tins arranged by worker' is the wordplay.
'arranged' indicates anagramming the letters.
'by' says to put letters next to each other.
'worker' becomes 'ant' (worker is a type of ant).
'tins' with letters rearranged gives 'inst'.
'inst'+'ant'='INSTANT'
(Other definitions for instant that I've seen before include "Immediate, twinkling" , "like some coffee?" , "Occurring with no delay" , "pressing" , "Fast, flash" .)