Cash demanded fishily? (3)
I believe the answer is:
This clue could be a double definition.
'cash' is the first definition.
(thesaurus)
'demanded fishily?' is the second definition.
The answer and definition are different parts of speech. However, adjectives and past participle verbs occasionally define each other.
Can you help me to learn more?
(Other definitions for cod that I've seen before include "Not a real" , "Initially, pay when you receive the goods" , "Initially, pay when you get the goods" , "Large sea fish- it's a sham" , "swimmer" .)