Crossword Genius

Scaffolder's prompt -- taking roof off (6)

Ross

I believe the answer is:

rigger

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'scaffolder's' is the definition.
(I've seen this before)

I don't understand the remainder of the clue.

Can you help me to learn more?

(Other definitions for rigger that I've seen before include "Sailing ship; fraud" , "Scaffolding worker" , "'Long, pointed brush used by artists (6)'" , "Scaffolding erector" , "oilman" .)

I've seen this clue in The Telegraph.
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