Approach open river (8)

I believe the answer is:

overture

'approach' is the definition.
(I know that approach can be written as overture)

'open river' is the wordplay.
'open' becomes 'overt' (synonyms).
'river' becomes 'ure' (river in Yorkshire).
'overt'+'ure'='OVERTURE'

(Other definitions for overture that I've seen before include "10 {COMPOSITION]" , "Music played before an opera" , "Opening gambit" , "offer" , "Approach made with view to starting relationship" .)

I've seen this clue in The Telegraph and The Sun.

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