Crossword Genius

Take a risk, as a tree surgeon might? (2,3,2,1,4)

Ross

I believe the answer is:

go out on a limb

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'take a risk' is the definition.
(I've seen this before)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for go out on a limb that I've seen before include "Take a risk" , "Be brave (2,3,2,1,4)" , "become isolated" .)

I've seen this clue in The Guardian.
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