Small portion, no starter, is plenty (5)

I believe the answer is:

ample

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'is plenty' is the definition.
(ample means enough or plenty)

I don't understand how the rest of the clue works.

(Other definitions for ample that I've seen before include "Plentiful; capacious" , "Fairly large" , "Quite sufficient, more than enough" , "Plentiful, quite enough" , "Buxom" .)

I've seen this clue in The Sun.

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