Booking (6,4)
(Other definitions for yellow card that I've seen before include "Warning leading to temporary dismissal" , "Warning to footballers" , "Footballer's caution" , "With which a referee cautions player" , "Warning to footballer" .)
'booking' is the definition.
(I've seen this in another clue)
This is all the clue.
(Other definitions for date that I've seen before include "Oval fruit" , "Romantic meeting" , "Tryst" , "Tropical fruit" , "eg 1588" .)