Buffalo in river area for all to see (7)

I believe the answer is:

tamarau

'buffalo' is the definition.
(I know that tamarau is a type of buffalo)

'river area for all to see' is the wordplay.
'river' becomes 'tamar' (river in the southwest of England).
'area' becomes 'a' (maths abbreviation).
'for all to see' becomes 'u' (short for Universal film certificate).
'tamar'+'a'+'u'='TAMARAU'

'in' acts as a link.

(Another definition for tamarau that I've seen is " Buffalo".)

I've seen this clue in The Times.

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