Crossword Genius

When head's removed, touch fish (3)

Ross

I believe the answer is:

eel

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

'fish' is the definition.
(I know that eel is a type of fish)

'when head's removed touch' is the wordplay.
I cannot quite understand how this works, but
'when' could be 'e' (I've seen this in other clues) and 'e' is present in the answer.
The remaining letters 'el' is a valid word which might be clued in a way I don't understand.
This explanation may well be incorrect...

Can you help me to learn more?

(Other definitions for eel that I've seen before include "Long thin fish" , "Slippery type" , "Wriggly fish" , "Slippery swimmer (may be jellied)" , "Fish in the Lee?" .)

I've seen this clue in The Sun and The Telegraph.
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