What one pays when visiting a coffee chain (5)

I believe the answer is:

costa

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'coffee chain' is the definition.
(Costa is a chain of coffee shops)

I cannot understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for costa that I've seen before include "and 5 Down: Spanish holiday destination" , "A Spanish coast like Del Sol" , "___ Brava, Spanish resort area" , "-- Brava; -- Blanca" , "Rib (Botany, Zoology)" .)

I've seen this clue in The Guardian.

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