Crossword Genius

Overconfident birds on river (8)

Ross

I believe the answer is:

cocksure

'overconfident' is the definition.
(I know that overconfident can be written as cocksure)

'birds on river' is the wordplay.
'birds' becomes 'cocks' (cock is a kind of bird).
'on' is a charade indicator (letters next to each other).
'river' becomes 'ure' (river in Yorkshire).
'cocks'+'ure'='COCKSURE'

(Other definitions for cocksure that I've seen before include "Showing arrogance" , "Annoyingly self-confident" , "The fowl begins to be offensively certain." , "Arrogantly certain" , "Arrogantly confident" .)

I've seen this clue in The Telegraph.
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