Circular sandwiches (5)

I believe the answer is:

round

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'circular' is the definition.
(I know that circular can be written as round)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for round that I've seen before include "Circular - 18 holes" , "Item of music - single item of ammunition" , "unsuitable for square pegs" , "purchase of drinks" , "Full" .)

I've seen this clue in The Mirror.

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