Flag flown by ship about to sail (4,5)

I believe the answer is:

blue peter

(Other definitions for blue peter that I've seen before include "Flag flown when about to sail - TV programme" , "shown readiness to go overseas" , "Signal flag - children's TV programme" , "Flag flown when about to leave port - TV programme" , "Flag raised before sailing" .)

I've seen this clue in the Sydney Morning Herald.

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