It's strange for a nut to taste of fish! (4)
I believe the answer is:
tuna
'fish' is the definition.
(tuna is a type of fish)
'it's strange for a nut to taste' is the wordplay.
'a nut' anagrams to 'TUNA'.
However, I am not sure how the anagram is indicated.
'of' acts as a link.
Can you help me to learn more?
(Other definitions for tuna that I've seen before include "Species of fish" , "Popular food fish" , "Large salt water fish" , "Fish; edible cactus" , "Large tasty fish, fond of a nut" .)