To the cricket openers, disastrous spectacles (4)

I believe the answer is:

pair

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'spectacles' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how they can define each other.

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for pair that I've seen before include "Set of two" , "Duo" , "flight of stairs" , "Twosome" , "Agreement to avoid division" .)

I've seen this clue in the Evening Standard.

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