The Crossword Centre Clue-Writing Competition

CCCWC September competition voters’ comments
 
Clue no. 21: Leaving Earth use time gate – Doctor Who knows when

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A clue to GUESTIMATE.
3 comments refer to this clue (from 3 competitors, 0 others)

Here is the text

Comments on the clue
1.Should it not be doctored?
2.Clever idea, but cryptic reading is a bit unnatural
3.I like the wordplay but definition doesn't seem accurate