Stir up river, one of several in England (5)

I believe the answer is:

rouse

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'stir up' is the definition.
(I've seen this before)

'river one of several in england' is the wordplay.
'river' becomes 'r' (abbreviation for river).
'one of several in england' becomes 'ouse' (I can't justify this - if you can you should believe this answer much more).
'r'+'ouse'='ROUSE'

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(Other definitions for rouse that I've seen before include "Prod" , "Provoke" , "Waken" , "Bumper" , "To start" .)

I've seen this clue in The Times.

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