Boundary is square (4)

I believe the answer is:

four

I believe this clue is a double definition.

'boundary' is the first definition.
(cricket term)

'is square' is the second definition.
(four is a square number)

(Other definitions for four that I've seen before include "Cube root of 64" , "Boundary hit (cricket)" , "Set of bridge players?" , "Bridge quorum" , "Figure" .)

I've seen this clue in The Times.

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