Children's TV series, 1972-92, whose characters included Bungle, Zippy and George (7)

I believe the answer is:

rainbow

(Other definitions for rainbow that I've seen before include "in different colours" , "Multi-coloured arc in the sky" , "display of colour" , "Colourful arc in the sky" , "'I can sing a - - ' (song)" .)

I've seen this clue in The Independent.

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