Crossword Genius

Puzzle given a couple of marks for wrong and right answers, we hear (8)

Ross

I believe the answer is:

acrostic

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

I cannot understand how the remainder of the clue works.

(Other definitions for acrostic that I've seen before include "Legal document" , "a little puzzling" , "Form of word puzzle" , "Initial letter puzzle" , "RAC stoic (anag) - lines of writing where certain initial letters form a word or proverb" .)

I've seen this clue in The Guardian.
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