Crossword Genius

Count half of wall drawings (4)

Ross

I believe the answer is:

graf

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

I don't understand the rest of the clue.

Can you help me to learn more?

(Other definitions for graf that I've seen before include "Steffi --, tennis champion" , "Noted tennis player" , "Steffi --, tennis player" , "Seven-times women's Wimbledon champion, b. 1969" , "German tennis player, b. 1969" .)

I've seen this clue in The Telegraph.
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