Young animal or duck in the river (4)

I believe the answer is:

foal

'young animal' is the definition.
(I've seen this in another clue)

'duck in the river' is the wordplay.
'duck' becomes 'o' (resembles zero - 'duck' in cricket).
'in the' is an insertion indicator.
'river' becomes 'fal' (I've seen this before).
'o' placed within 'fal' is 'FOAL'.

'or' acts as a link.

(Another definition for foal that I've seen is " A young horse for Olaf".)

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