Crossword Genius

A short indication of approval heard for puzzle (8)

Ross

I believe the answer is:

acrostic

'puzzle' is the definition.
(I've seen this before)

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

(Other definitions for acrostic that I've seen before include "Puzzle involving a hidden message" , "Poem with word(s) reading downwards" , "Socratic sort of word puzzle" , "Poem where first letters of lines spell a word" , "Puzzle involving leading characters" .)

I've seen this clue in The Telegraph.
Want a hint initially instead of a full solution? Install my app