Ruler brings his own salad (6)

I believe the answer is:

caesar

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'salad' is the definition.
(Caesar salad is an example)

I can't explain the remainder of the clue.

(Other definitions for caesar that I've seen before include "Julius, stabbed by Brutus" , "Old Roman leader" , "US comedian" , "extraction operation" , "See 2" .)

I've seen this clue in The Daily Express.

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