Crossword Genius

Nomad lost face in forearm fracture (6)

Ross

I believe the answer is:

roamer

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'nomad' is the definition.
(I've seen this in another clue)

I cannot understand how the remainder of the clue works.

Can you help me to learn more?

(Other definitions for roamer that I've seen before include "Aimless traveller" , "One who travels aimlessly over a wide area" , "Unsettled person" , "Wanderer" .)

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