Roam in Bush & encounter extremes (6)

I believe the answer is:

wander

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'roam' is the definition.
(I know that roam can be written as wander)

I don't understand how the rest of the clue works.

Can you help me to learn more?

(Other definitions for wander that I've seen before include "go wrong" , "Roam about or digress" , "Go to and fro" , "Warden (anag.)" , "Roam around aimlessly" .)

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

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