Crossword Genius

Did Edgar write as a mural expert? (7)

Ross

I believe the answer is:

wallace

I'm a little stuck... Click here to teach me more about this clue!

'did edgar write' is the definition.
I can't judge whether this defines the answer.

'a mural expert?' is the wordplay.
'a mural' becomes 'wall' (I can't justify this - if you can you should believe this answer much more).
'expert?' becomes 'ace' (ace can informally mean very good).
'wall'+'ace'='WALLACE'

'as' acts as a link.

Can you help me to learn more?

(Other definitions for wallace that I've seen before include "Scottish champion" , "Edgar ---, crime writer; an art Collection" , "Edgar -, English thriller writer" , "15 [AMERICAN] vice-president" , ".Robbie Burns poem 'Scots, wha hae wi' ...... bled'" .)

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