Couple of ducks making spectacles of themselves? (4)

I believe the answer is:

pair

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'couple' is the definition.
('pair' can be a synonym of 'couple')

I cannot understand how the rest of the clue works.

(Other definitions for pair that I've seen before include "Couple - wed" , "Duo" , "flight of stairs" , "players of duet?" , "Cereal used as food" .)

I've seen this clue in the Evening Standard.

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