Some heroes are a bit fishy! (3)
I believe the answer is:
roe
'a bit fishy' is the definition.
I can't tell whether this definition defines the answer.
'some heroes are' is the wordplay.
'some' indicates the answer is hidden within the clue (some parts of the word are used).
'ROE' is hidden in the letters of 'heroes are'.
Can you help me to learn more?
(Other definitions for roe that I've seen before include "Food from fish" , "Caviar" , "Mass of fish eggs" , "If hard, eggs" , "Lobster's ripe ovary" .)