1 across
Plain
starter
of
meal
daddy’s
eating
(6)
Plain starter of meal daddy’s eating (6)
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The definition is at the beginning of the clue.
How the clue works
Right, so Plain is your definition here — think pampas grassland, not the everyday word "plain". For the wordplay, take PAPAS ("daddy's") and get it to swallow M, which is just the "starter of meal" — pop that M inside PAPAS and you land on the answer.