Construction expert memorialised Scottish war hero (7)

I believe the answer is:

wallace

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'hero' is the definition.
(I have seen 'Scottish hero' mean 'wallace' so perhaps 'hero' could also mean 'wallace')

'construction expert' is the wordplay.
'construction' becomes 'wall' (wall is a kind of construction).
'expert' becomes 'ace' (ace can informally mean very good).
'wall'+'ace'='WALLACE'

'memorialised scottish war' acts as a link.
This may not be right. Some or all of it may be part of another bit of the clue.

Can you help me to learn more?

(Other definitions for wallace that I've seen before include "With twenty one across, Oscar-winning cartoon pair" , "Edgar ---, crime writer; an art Collection" , "Scottish insurgent" , "Alfred Russel ---, naturalist" , ".Robbie Burns poem 'Scots, wha hae wi' ...... bled'" .)

I've seen this clue in The Independent.

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