Add sugar (7)

I believe the answer is:

sweeten

'add sugar' is the definition.
(I've seen this before)

This is all the clue.

(Other definitions for sweeten that I've seen before include "Add, eg, sugar to" , "Make less bitter" , "Modify" , "Make more palatable" , "Add sugar etc" .)

I've seen this clue in The Star Tribune, The Mirror, the Sydney Morning Herald and The Guardian.

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