Tell you it's right and make you very happy (6)

I believe the answer is:

relate

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'tell' is the definition.
(as in to tell or relate a story)

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

(Other definitions for relate that I've seen before include "Tell; a counselling service" , "Make a logical or causal connection" , "Tell (a story)" , "Narrate or connect things" , "Narrate, tell in detail" .)

I've seen this clue in the Evening Standard.

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