Crossword Genius

Dog I trust in Rome (4)

Ross

I believe the answer is:

fido

I'm a little stuck... Click here to teach me more about this clue!

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

I can't explain the remainder of the clue.

Can you help me to learn more?

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

I've seen this clue in The Sun.
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