They take turns as openers (4)

I believe the answer is:

keys

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

I don't understand the rest of the clue.

(Other definitions for keys that I've seen before include "Low-lying Caribbean islands" , "Low islands, sycamore fruits" , "Landing places" , "Musical scales" , "Lock-openers?" .)

I've seen this clue in the Evening Standard.

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