Fish, fox or fool (3)
I believe the answer is:
cod
This could be a double definition.
'fish fox' is the first definition.
'cod' can be an answer for 'fish' (I've seen this before). I'm unsure of the 'fox' bit.
'fool' is the second definition.
(synonyms)
'or' acts as a link.
Can you help me to learn more?
(Other definitions for cod that I've seen before include "Fish; fake (colloq.)" , "Cash on delivery for hoax" , "A fish; a hoax, parody" , "A white fish" , "No payment in advance" .)