In Sussex, as you can see, it's a stream (4)

I believe the answer is:

arun

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'in sussex as you can see' is the definition.
I don't know anything about this answer so I can't judge whether this works.

'a stream' is the wordplay.
'stream' becomes 'run' (run is a kind of stream).
'a'+'run'='ARUN'

'it's' acts as a link.

Can you help me to learn more?

(Other definitions for arun that I've seen before include "River of West Sussex" , "W. Sussex district, river" .)

I've seen this clue in the Evening Standard.

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