Talk too much (about) (2,2)

I believe the answer is:

go on

(Other definitions for go on that I've seen before include "Harry Secombe or Spike Milligan, say" , "Witter - words of encouragement" , "Stupid person or ruffian - go on with it" , "Proceed" , "Peter Sellers, Spike Milligan or Harry Secombe" .)

I've seen this clue in The Guardian.

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