Crossword Genius

Its first letters spell a message (8)

Ross

I believe the answer is:

acrostic

(Other definitions for acrostic that I've seen before include "Puzzle spelling out something with first letters" , "problem" , "Puzzle involving a hidden message" , "RAC stoic (anag) - lines of writing where certain initial letters form a word or proverb" , "Bit of wordplay" .)

I've seen this clue in The Guardian.
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