Double-cheat without even being sweet (6)

I believe the answer is:

dulcet

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'being sweet' is the definition.
('dulcet' can be a synonym of 'sweet')

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

Can you help me to learn more?

(Other definitions for dulcet that I've seen before include "Sweet-sounding, melodious" , "(Of sound) sweet and soothing" , "Of voice or tone, sweet-sounding" , "(Of sound) melodious" , "Sweet, gentle (tones)" .)

I've seen this clue in the Sydney Morning Herald.

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