Crossword Genius

Movement of water round wet rocks (8)

Ross

I believe the answer is:

undertow

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

'movement of water' is the definition.
'undertow' can be an answer for 'movement' (undertow is a kind of movement). I am unsure of the 'of water' bit.

'round wet rocks' is the wordplay.
'rocks' is an anagram indicator.
'round'+'wet'='roundwet'
'roundwet' is an anagram of 'UNDERTOW'.

Can you help me to learn more?

(Other definitions for undertow that I've seen before include "Wet round (anag.)" , "Strong current opposed to that on surface" , "Submarine movement" , "Current, unforeseen" , "awkward current" .)

I've seen this clue in The Guardian.
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