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Fear last couple is missing, so returns to moon (6)

Ross

I believe the answer is:

phobos

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'to moon' is the definition.
(I've seen this before)

I can't explain the rest of the clue.

Can you help me to learn more?

(Other definitions for phobos that I've seen before include "heavenly body" , "Planetary moon" , "another world" , "Moon of Mars" , "Satellite of Mars" .)

I've seen this clue in The Daily Express.
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