Duck emerging from river leaves (7)

I believe the answer is:

pochard

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'duck' is the definition.
(I know that pochard is a type of duck)

'river leaves' is the wordplay.
'river' becomes 'Po' (the river Po in Italy).
'leaves' becomes 'chard' (I am not sure about this - if you are sure you should give a lot more credence to this answer).
'po'+'chard'='POCHARD'

'emerging from' acts as a link.

Can you help me to learn more?

(Other definitions for pochard that I've seen before include "Spanish wine" , "diver" , "bird" , "Type of diving duck" .)

I've seen this clue in The Telegraph.

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