Gently touch fish

I believe the answer is:

dab

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

This might be a double definition.

'gently touch' is the first definition.
'dab' can be an answer for 'touch' (I've seen this in another clue). I'm unsure of the 'gently' bit.

'fish' is the second definition.
(dab is a type of fish)

Can you help me to learn more?

(Other definitions for dab that I've seen before include "Digital radio" , "Expert; flatfish" , "A small fish - bad one" , "Fingerprint - fish" , "Flounder" .)

I've seen this clue in The Daily Mail.

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