Opening plan (5)

I believe the answer is:

hatch

I believe this is a double definition.

'opening' is the first definition.
(I've seen this before)

'plan' is the second definition.
(thesaurus)

(Other definitions for hatch that I've seen before include "contrive to > emerge in > shade" , "Draw fine lines" , "Mountain goat" , "Deck opening; (egg) open" , "Come up with" .)

I've seen this clue in The Telegraph.

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