Bereaved woman seizes new opportunity (6)

I believe the answer is:

window

I'm a little stuck... Click here to teach me more about this clue!

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

I don't understand the rest of the clue.

(Other definitions for window that I've seen before include "Skylight" , "See 1 down" , "One furthest from the aisle?" , "Glazed opening" , "Opening (of opportunity?)" .)

I've seen this clue in The Independent.

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