Crossword Genius

Envoy's no time to get certificate (7)

Ross

I believe the answer is:

diploma

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'certificate' is the definition.
(diploma is a kind of certificate)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for diploma that I've seen before include "documentation" , "degree certificate" , "Certificate awarded by college for educational attainment" , "Certificate of education" , "What a student seeks" .)

I've seen this clue in The Sun.
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