Ludicrous remark upset several cashiers there (11)

I believe the answer is:

supermarket

I'm a little stuck... Click here to teach me more about this clue!

'several cashiers there' is the definition.
I can't tell whether this definition defines the answer.

'ludicrous remark upset' is the wordplay.
'ludicrous' indicates an anagram (a ludicrous spelling).
'remark'+'upset'='remarkupset'
'remarkupset' is an anagram of 'SUPERMARKET'.

Can you help me to learn more?

(Other definitions for supermarket that I've seen before include "Grocery store" , "Large retail outlet" , "Large shop" , "Large store selling food and household supplies" .)

I've seen this clue in The Irish Times.

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