20 down
On
board
boat,
ten
days
–
be
there!
(6)
On board boat, ten days – be there! (6)
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The definition is at the end of the clue.
How the clue works
The definition is be there!, meaning to be present. The answer is hiding inside "boAT TEN Days" — "on board" is your hint that the word is tucked within the phrase.