Wolf crossing stream (4)

I believe the answer is:

flow

I'm a little stuck... Click here to teach me more about this clue!

'stream' is the definition.
(I know that stream is a kind of flow)

'wolf crossing' is the wordplay.
'wolf' anagrams to 'FLOW'.
But, I'm not clear how this is indicated.

Can you help me to learn more?

(Other definitions for flow that I've seen before include "(Forward) movement of liquid" , "Fluid motion" , "Wolf (anag.)" , "Trickle" , "Move along as a stream" .)

I've seen this clue in The Mirror.

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