Ruin the opening? (7)

I believe the answer is:

undoing

I believe this clue is a double definition.

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

'opening?' is the second definition.
(opening is a kind of undoing)

'the' acts as a link.

(Other definitions for undoing that I've seen before include "Cause of ruin" , "Taking apart" , "(A person's) ruin or downfall" , "Ruin - disaster" .)

I've seen this clue in The Irish Independent, The Sun, The Telegraph, The Globe and Mail and The Guardian.

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