Darius lost in surrounding area (6)

I believe the answer is:

radius

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'surrounding area' is the definition.
'radius' can be an answer for 'area' (thesaurus). I am not sure about the 'surrounding' bit.

'darius lost' is the wordplay.
'lost' indicates an anagram.
'darius' is an anagram of 'RADIUS'.

'in' is the link.

Can you help me to learn more?

(Other definitions for radius that I've seen before include "Half a circle's diameter" , "Outer arm bone" , "Straight line from circle's centre to circumference" , "Line from centre to edge of a circle" , "Wine; burial places" .)

I've seen this clue in The Mirror.

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