Crossword Genius

Mustard pickle (10)

Ross

I believe the answer is:

piccalilli

(Other definitions for piccalilli that I've seen before include "Chopped vegetables, mustard and hot spices" , "Spicy pickle" , "Mixed vegetables in a mustard sauce" , "Relish with chopped pickled cucumbers, green peppers and onion" , "preserve with mustard" .)

I've seen this clue in The Guardian.
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