Crossword Genius

Letters to spell ‘spit’? That’s child’s play (7)

Ross

I believe the answer is:

sandpit

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'play' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for sandpit that I've seen before include "place where youngsters can play" , "Play area; quarry" , "Site of castle perhaps" , "children may play here" , "Children's play area - it'd snap (anag)" .)

I've seen this clue in The Everyman puzzle in The Observer.
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