Longman Dictionary of Contemporary English
colour supplement
noun
EXAMPLES FROM CORPUS
▪ A colour supplement had published one of her stories in a series by new authors.
▪ Monday On this particular Monday morning, Adrian had the feeling that he had woken up in a colour supplement.
▪ Nobody could ever have thought that joining a cricket club was like opening a Sunday paper colour supplement.
▪ Without you the Sunday Times colour supplement would come out black-and-white.
WordNet
colour supplement
n. (British) a magazine that is printed in color and circulated with a newspaper (especially on weekends)
Usage examples of "colour supplement".
I even got mentioned in a colour supplement article last May - don't policemen read the Sunday papers?
Likewise he knew the brand of abdominizing exerciser that she'd ordered in an insane moment of optimistic piety from the back of a colour supplement.
She began to turn the pages of the Sunday Times colour supplement.