As in Leo maybe from the deep? (3,4)

I believe the answer is:

sea lion

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'the deep?' is the definition.
Although both the answer and definition are singular nouns, I don't understand how one could define the other.

'as in leo maybe' is the wordplay.
'maybe' is an anagram indicator.
'as'+'in'+'leo'='asinleo'
'asinleo' is an anagram of 'SEA-LION'.

'from' acts as a link.

Can you help me to learn more?

(Other definitions for sea lion that I've seen before include "Marine beast, the male having a mane" , "Large seal" , "Creature" , "Acrobatic aquatic mammal" , "Large marine mammal" .)

I've seen this clue in The Globe and Mail.

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