Crossword Genius

Promise to have town walls removed (4)

Ross

I believe the answer is:

avow

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'promise' is the definition.
(I've seen this in another clue)

I can't explain the remainder of the clue.

Can you help me to learn more?

(Other definitions for avow that I've seen before include "Make a promise" , "State openly" , "Admit openly" , "Solemnly declare" , "Assert, swear" .)

I've seen this clue in the Sydney Morning Herald.
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