Crossword Genius

Fish treats -- pay attention (5,5)

Ross

I believe the answer is:

nurse shark

'fish' is the definition.
(nurse shark is a kind of fish)

'treats pay attention' is the wordplay.
'treats' becomes 'nurses' (nursing is a kind of treating).
'pay attention' becomes 'hark' (I've seen this in another clue).
'nurses'+'hark'='NURSE SHARK'

I've seen this clue in The Telegraph.
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