Boundary of river, generally (5)

I believe the answer is:

verge

'boundary' is the definition.
(verge is a kind of boundary)

'of river generally' is the wordplay.
'of' indicates the answer is hidden within the clue.
'VERGE' is hidden within 'river generally'.

(Other definitions for verge that I've seen before include "emblem of office for bishop" , "Grassy road edge" , "Margin, edge" , "Margin or brink" , "Side of road" .)

I've seen this clue in The Independent.

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