Crossword Genius

Something Bob the Builder might do in two different books involving twist (9)

Ross

I believe the answer is:

brickwork

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

'twist' is the definition.
Although both the answer and definition are singular nouns, I cannot understand how one could define the other.

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Another definition for brickwork that I've seen is " walls?".)

I've seen this clue in The Telegraph.
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