Crossword Genius

Partly visible satellite found by doctor, perhaps, if not working (4-4)

Ross

I believe the answer is:

half-moon

'partly visible satellite' is the definition.
(a moon is a satellite)

I cannot understand how the remainder of the clue works.

(Other definitions for half-moon that I've seen before include "Earth's satellite at first (or last) quarter" , "Semi-visible natural satellite" .)

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