Crossword Genius

River Po's opening leading to sea (4)

Ross

I believe the answer is:

deep

'sea' is the definition.
(thesaurus)

'river po's opening leading' is the wordplay.
'river' becomes 'dee' (River Dee**).
'opening' suggests taking the first letters.
'leading' means one lot of letters go next to another.
The initial letter of 'pos' is 'p'.
'dee'+'p'='DEEP'

'to' acts as a link.

(Other definitions for deep that I've seen before include "late" , "Extending far down" , "Intense; low (in pitch)" , "Main" , "Sunk low" .)

I've seen this clue in The Telegraph.
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