Crossword Genius

Fish that could give you a bad turn (3)

Ross

I believe the answer is:

dab

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

'fish that could give you' is the definition.
'dab' can be an answer for 'fish' (dab is a type of fish). I am not sure about the rest of the definition.

'a bad turn' is the wordplay.
'turn' shows that the letters should be reversed in order.
'bad' written backwards gives 'DAB'.

Can you help me to learn more?

(Other definitions for dab that I've seen before include "Press gently; flatfish" , "Touch gently - fingerprint" , "A bad, backward fish" , "Bad kind of fish" , "Fingerprint - fish" .)

I've seen this clue in the Evening Standard.
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