Crossword Genius

Bird or mouse? (7)

Ross

I believe the answer is:

chicken

I believe this is a double definition.

'bird' is the first definition.
(I know that chicken is a type of domestic fowl)

'mouse?' is the second definition.
(thesaurus)

'or' acts as a link.

(Other definitions for chicken that I've seen before include "Bird, coward (colloq.)" , "Prov. cowardly bird" , "Proverbial road-crosser" , "Cowardly (colloq.)" , "Yellow-bellied" .)

I've seen this clue in The Telegraph.
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