Crossword Genius

Nominally faithful pet (4)

Ross

I believe the answer is:

fido

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'faithful pet' 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 fido that I've seen before include "it would disperse fog" , "Dog perhaps" , "Typical dog's name" , "Fog disperser" .)

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