One's entire passion for offal with fish, say (5,3,4)
I believe the answer is:
heart and soul
'one's entire passion' is the definition.
I can't judge whether this definition defines the answer.
'offal with fish say' is the wordplay.
'offal' becomes 'heart' (I can't explain this - if you can you should believe this answer much more).
'with' becomes 'and'.
'fish say' becomes 'soul' (fish is a kind of soul).
'heart'+'and'+'soul'='HEART AND SOUL'
'for' acts as a link.
Can you help me to learn more?
(Other definitions for heart and soul that I've seen before include "With complete devotion" , "With complete sincerity" .)