What does the cryptic crossword clue "Improve on tea, say, with more of it: that's a test for humanity (7)" mean?

The wordplay uses a charade (building blocks). CAP (synonym="improve on") + T (synonym="“tea”") + CHA (synonym="tea") = CAPTCHA The answer is CAPTCHA.

Improve on tea, say, with more of it: that's a test for humanity (7)

Guardian Cryptic #29276 | 11 Across | 2024-01-11 flower

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