"Hold the ________!,” diner shout (4)

I believe the answer is:

mayo

(Other definitions for mayo that I've seen before include "You'll find it in the Emerald Isle" , "part of Ireland" , "Cold, creamy sauce (abbr)" , "Thick creamy dressing" , "County of north-west Ireland" .)

I've seen this clue in the Penny Press.

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