Simple course — tacos for starters (6)

I believe the answer is:

modest

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'simple' is the definition.
(synonyms)

I can't explain the rest of the clue.

(Other definitions for modest that I've seen before include "Demure" , "self-effacing" , "Unassuming; limited" , "Unassuming; small" , "Humble, not pretentious or showy" .)

I've seen this clue in The Hindu.

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