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Obliged to return something bought at the grocer’s (4)

Ross

I believe the answer is:

edam

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'grocer's' is the definition.
Although both the answer and definition are singular nouns, I don't see how one could define the other.

I don't understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for edam that I've seen before include "Yellow cheese with a red covering" , "Cheese made in Holland" , "Kind of cheese" , "milk product" , "Dutch specialty" .)

I've seen this clue in the Evening Standard.
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