Crossword Genius

A bit of free lunch is always fishy (3)

Ross

I believe the answer is:

eel

I'm a little stuck... Click here to teach me more about this clue!

'always fishy' is the definition.
I can't judge whether this defines the answer.

'a bit of free lunch is' is the wordplay.
'a bit of' says the answer is hidden in the clue (I've seen 'a bit' mean this (the answer is formed by a bit of the clue)).
'EEL' is hidden in the letters of 'free lunch is'.

Can you help me to learn more?

(Other definitions for eel that I've seen before include "A sea snake" , "Large elver" , "Electric swimmer, perhaps?" , "Slippery type" , "Moray or electric, for instance" .)

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