It goes to the wall in a big way (5)

I believe the answer is:

mural

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'wall in a big way' is the definition.
'mural' can be an answer for 'wall'. I'm not sure about the 'in a big way' bit.

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for mural that I've seen before include "Wall design" , "Wall art" , "Large wall painting" , "Wall decoration" , "Artwork" .)

I've seen this clue in the Evening Standard.

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