The Crossword Centre Clue-Writing Competition

CCCWC April competition voters’ comments
 
Clue no. 10: Cut off direct source of cross-channel migrations?

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A clue to REMOTE CONTROL.
2 comments refer to this clue (from 1 competitor, 1 other)

Here is the text

Comments on the clue
1.Good idea but not fully convinced by the definition
2.Topical and imaginative and worthy of points but the definition just errs too much on the broad side for me.