"Far out, man” (3)

I believe the answer is:

rad

I believe this clue is a double definition.

'far out' is the first definition.
(I've seen this in another clue)

'man' is the second definition.

(Other definitions for rad that I've seen before include "measure of dangerous activity" , "Unit of radiation" .)

I've seen this clue in the King Feature Syndicate.

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