Linguist’s sandwich (6)

I believe the answer is:

panini

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This could be a double definition.

'linguist's' is the first definition.
(Panini is an example)

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

Can you help me to learn more?

(Other definitions for panini that I've seen before include "heated sandwiches" , "Italian toasted sandwich" , "Italian bread" , "type of bread" .)

I've seen this clue in The Hindu.

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