Day of the week (4)
'day of the week' is the definition.
(Tuesday is an example)
This is all the clue.
(Other definitions for tuesday that I've seen before include "Shrove ____" , "Weekday" , "Sea duty (anag)" , "When Grundy was christened" , "Day the Romans called the day of Mars" .)
(Other definitions for weds that I've seen before include "midweek" , "Wagers no longer" , "Gets married" , "Joins together" , "day?" .)