The Crossword Centre Clue-Writing Competition

CCCWC November competition voters’ comments
 
Clue no. 1: A jolly on returning plane sometimes provides a sandwich

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A clue to SUBMARINE.
1 comment refers to this clue (from 1 competitor, 0 others)

Here is the text

Comments on the clue
1.I don't understand why jolly = marine, or why plane sometimes = bus.