Crossword Genius

Go with flattery when conversing (10)

Ross

I believe the answer is:

complement

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'go' is the definition.
The definition and answer can be both related to change as well as being verbs in their base form.
Perhaps there's a link between them I don't understand?

I cannot understand how the rest of the clue works.

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(Other definitions for complement that I've seen before include "Contingent" , "This number on board" , "all who work on board" , "Companion" , "ship's crew" .)

I've seen this clue in The Telegraph.
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